BVB are the 10th biggest club in europe. Whil i agree they can't or won't accumulate a couple of european class players onm the bench like Bayern does, they still could assemble a decent squad of 22-24 players that are good enough to play in the upper quarter of the BuLi. Fact is, they didn't. Must have been a real surprise for them that there were 50+ games coming up and that players sometimes get injured. If your answer for a missing CB, Fullback, midfielder or winger is always the same one player, you're asking for trouble, and it is not bad luck that is to blame, but a failure in planning.
Bayern aside, Schalke had as much rotten luck with injuries as BVB had without making such a fuss about it.
What the hell are you talking about?
This was the squad going into the season 2013/2014:
GK: Weidenfeller (Langerak)
LB: Schmelzer (Durm)
CB: Hummels, Subotic (Sokratis, Sarr)
RB: Piszczek (Großkreutz)
DM: Bender (Kehl)
CM: Gündogan (Sahin)
LW: Reus (Aubameyang)
CAM: Mkhitaryan (Ducksch)
RW: Kuba (Hofmann)
CF: Lewandowski (Schieber)
The only real complaint you could have had about this squad was the quality of the striker backup. The vast majority of our offensive players could play multiple positions on roughly the same level including a CM/AM hybrid.
Piszczek was expected to be out for the majority of the first half of the season, so Großkreutz became the starter for that time with Durm being his direct backup. If Durm would be needed for the other flank squad player Kirch would have moved up.
Gündogan´s injury (especially the extend of it) was completely unforseeable. We could only react on this in the winter, which we did with Jojic. Having a highly rated defender talent as Sarr as 4th CB is not the weirdest planning. Did not help that he missed a part of September and the whole October because of an injury slowing down his development and was completely out of rythm when the hammer blow came.
Comparing our injury situation with the one of Schalke does simply not make that much sense, just because they missed a similar number of players. This is not about total numbers. This is about the concentration of the injuries. We had the whole offensive arsenal at out disposal, but our complete devensive part of the team was gone. I don´t understand, how it is so hard to grasp what this does to a team. Replacing single players is one topic, replacing whole systems of players a completely other one.
This becomes less about the sheer quality of the backups and more about the interplay as a whole: coordination, understanding, pressing and organisation. We played devensive systems that did not make a single competive game before in these forms, nearly a dozen different CB pairings over the course of the season.
What made it even worse was that we had nearly no time to develop a decent interplay in training because we played every four days. We struggled immensively vs. the top teams in the league, because our pressing system has fallen apart, but somehow made it through the most difficult group in the CL, which we clearly prioritised at that time. After six, seven horrible weeks we finally caught a break, literally. The Winter break gave Klopp and his coaches the chance to actually train interplay and create a working system in the back. Manuel Friedrich, who had to come in because we basically missed four central defenders (two because of injuries and two because of lack of playing rythm after injuries) could be really integrated into the team, Oliver Kirch and the newcomer Milos Jojic became real assets for them.
We did not suddenly became lucky with injuries in the second part of the season. We still played without at least five starters every single game, but the injuries became more balanced. Kuba was out for the rest of the season, but Piszczek got back to a decent level. Reus missed several weeks, but Hummels returned. Kehl fully recovered from several smaller injuries.
In the end, we recovered nicely because of the before mentioned things, got second in the league pretty comfortably, scared the shit out of the later CL winners and gave Bayern Munich a proper fight in the Cup final.
We certainly had not much luck this season, though. Missing five or six starters at the same time can happen if you are unlucky. Having them all being defenders and central/defensive midfielder is highly unlikely and nothing short of a horror scenario.
About Bittencourt and Leitner: Both had decent seasons at their clubs for layers their age. They could have been played at BVB releasing more solid players to cover the key positions. BVB are never shy to emphasise how well young players are developed by them, yet they couldn't or wouldn't either of them.
We did develop players last season. Durm and Hofmann turned out nicely.
Leonardo Bittencourt had one problem and this was Jonas Hofmann. It was Klopp´s decision to go for the latter because he had a more defined grasp on the system, which set the transfer to Hannover in motion, although it was always clear that the intention is to bring him if he develops well.
Moritz Leitner is a different case. Leitner had over 2000 minutes at Dortmund to leave a lasting positive impression and simply failed to show up most of the time. Leitner does not lack the talent, but the necessary attitude to make it at a club of Dortmund´s calibre IMO and I honestly don´t think he will gain it in time. Leitner´s problem was not the lack of chances. He simply did not take them.
It also does not change the point, which I made earlier. Both would not have changed the problems of Dortmund in the slightest. The offensive was not the problem. We scored 80 goals in the league season, which is a good figure no matter how you twist it. The problems were in the back, which led to a collapse of our pressing, which is essential for the way we play. With that the two would not have been a help at all. Just bodies for the bench, which is not what they need.