Not really sure what point you are making here. Who will the new arrivals replace in the team/on the bench? You can only have 11 on the pitch at any one time, no matter how big your squad, how much of an improvement will they be? Like I said, they aren't bad players, but then you don't currently have bad players, but if you want to step up, it won't be by buying a mid-table squad.
Also, you are suggesting you have no one to replace Suarez, who created/scored almost half your goals last season, who is going to give you those stats now?
Stats : I'll refer you back to my comprehensive 'Goals' posts on p54 and the follow-up on p56
Improvement doesn't just come from the starting 11 because in today's game it's likely 13-14 will play in each match. We've improved in defence, in midfield and Aspas was the best we could manage as a substitute last season, which probably tells you all you need to know