Costa is a better striker than Remy, but I don't like how dirty he is, and therefore, I wouldn't want him on my team. Don't care how good he is. I'd say he's the third best striker in the league, behind Aguero and Sturridge, but my metric wasn't purely talent. It's a way of playing and an attitude. I actually am surprised by my own post...I can't believe I put Oscar on the list, since he dives so much. I'd probably take him off, even though he is very talented.
Frankly, I forgot about Matic and think that Mignolet is good enough (though I admit Courtois is better), so we don't need him. Same with De Gea. Better, but Mignolet is good enough that I don't care. Same with Hart, even though I included him for some reason. I don't rate Cahill and Terry as highly as some, but I wouldn't mind Cahill as a defender. He's a good old school player. But I'd rather have Koscielny; he'll cost you the odd penalty and red card, but his recovery speed is excellent. Imagine him paired with a defender who could actually run. And we only need one defender.
I didn't actually think about every player on all those teams, it was just a quick thought, which is why I missed Matic. He's probably the best DM in the Prem right now. But then again, if Lucas actually played, I think he's good enough at the defensive part of the game to make a big enough difference to the defense.