What foundations? I'll give you Martial, LW is settled for the future if he comes good. But Rashford is nowhere near the level that United require yet. Unlike Martial, he doesn't appear to be one of those world class potential that you can be fairly confident of improving to that level. At this point, he is at a crossroads in his career, he could drastically improve and become Harry Kane-ish, or he could just be another Welbeck. Either way, he is not someone we can be reliant on, like Martial, so it is no foundation.
Rojo perhaps was a decent LvG buy. But besides that, the "foundation" he left was Depay, Schneiderlin, Schweinsteiger, Darmian, Shaw, Herrera and Blind - players that Jose either cleared out or will clear out in the future. From the SAF era we have two aging wingers as FBs and Jones/Smalling who are good enough squad players, but they are no products of van Gaal's "foundations".
He did as bad a job as Moyes bar the FA Cup, which elevates him marginally. He destroyed our team, our mentality and our interest in football for a brief period.
Real "foundations" would be the team Jose left for Conte at Chelsea. Some flaws, but the quality of Matic, Fabregas, Costa, etc who formed the core of a title winning squad, and most of whom were again instrumental in Conte winning the league (though of course, credit to Conte for improving and building on that - I am not saying Jose is responsible for their win). LvG did not leave a single player of that quality for Jose bar Martial perhaps, and even sold the only player who could have been at that level - di Maria.
Agree with this. I expected him to have a mass clearout followed by class signings like Pep did, but Jose seems to have tempered his own expectations. And while I absolutely adore Zlatan, Jose should have gotten another younger striker in his first season with us itself, considering Zlatan was a short term solution. Since he didn't do that, he had no choice but to choose the best out of a rather poor crop of strikers available in the market this summer.
He left a nicely balanced squad of players with some incredibly promising players. Also it was a small squad, meaning that 4-5 of the right signings and it could of brought everyone up a level into a very good team. It had it's weaknesses but this is what Mourinho took over:
GK: De Gea, Romero - Best goalkeeper and back up goalkeepers in the world
Fullbacks: Valencia, Darmian, Blind, Shaw, Young (now) TFM- Valencia has been an excellent right back, Darmian is a decent squad player and can cover both sides (you need those, but obviously not starter), Blind in the right system is an excellent player and was a very important player last season and one of our MOTM's against Ajax in the Europa League final, Shaw is a flop because of attitude, Young is one of our most important players now. Fosu mensah still a youngster
CB: Jones, Smalling, Rojo - All have been very important at times under Mourinho, Rojo when fit is probably first choice, all have injury problems. Can't really blame LvG on this as Mourinho has definitely liked them too, same with Fergie before.
CM: Carrick, Herrera, Fellaini, Schneiderlin, Schweinsteiger, Pereira - Carrick is old now, Schneiderlin and Schweiny big flops. Herrera was our player of the season last year, Fellaini is important for Mourinho though most fans I think would still want to get rid in an ideal world. Pereira youngster.
Wingers/forwards: Martial, Rashford, Mata, Lingard, Rooney, Memphis - Rooney and Memphis deadwood, both got rid of, lingard a useful squad player, mata can be quality in the right system, martial and rashford 2 of the most promising youngsters in the world.
So overall, Shaw, Schneiderlin, Schweinsteiger, Rooney and Memphis were definitely deadwood. 4 of those are gone, and the other one is still seen to have big potential if he ever gets his shit together. Young, Lingard, Darmian, Blind, Fellaini, Jones/Smalling and Mata have all been very useful at different times for Mourinho, but you could say that one of Jones/smalling should be cut, as should darmian probably. But it's not like they're useless players.
All in all, it definitely wasn't some huge bloated squad that needed a feck ton of work. It lacked in having star players, and Mourinho knew that, so he brought in Pogba, Ibra and Miki (and Bailly since our center backs were lacking someone reliable). But it was a small squad that didn't need too much trimming but mostly bringing in the right players. Change Mkhitaryan for Sane/Mane/Salah and our right wing is sorted. Change Lukaku this summer for Jesus for example (or Icardi even) and our striker is sorted. Bring in Mendy at left back instead of ignoring a clear problem position and our left back is sorted. We had plenty of good depth and backup players, and some good starting players, we've just mostly gone after the wrong players apart from Pogba, Matic and Bailly who has been unfortunate with injuries.
You say Mourinho left foundations, but I definitely think a close to ideal situation for a manager to come in and build the type of side he wants is what we had. A pretty small squad, some incredibly promising youngsters, you can get rid of a few that you don't need, a world class goalkeeper, and then bring in like 5 players that you really want to play in your way to turn it into a top squad. Looking at those players, a top class striker, right winger, center back, left back and center mid would've gone a long way. And Mourinho tried to do that apart from left back. Just they haven't quite worked out whether it's cause of injuries, or the wrong players (lukaku, mkhitaryan, ibra only being a 1 year solution).