The fact is that him and Lucas aren't good together. Sure they defended well during those first 3 games, but that's probably because we had Coutinho holding up the ball and helping us keep possession when we did have the ball. It's clear that in today's game, that Southampton were attacking us straight through the middle, and it was up to our defense to cover for a poor Gerrard and Lucas, because they were letting then right through.
Did anyone notice how Wanyama played? We had hardly any attacks through the middle, and when we did, he would help push them out to the side like a proper DM should. He pretty much bossed which way we attacked. We have been in desperate need of a real DM for years now. Lucas should be able to roam a bit more because he can actually hold the ball and move it. But his positioning is average.
I agree with Faz in that Gerrard has been awful over the last couple of games and it's not fair to blame Aspas or Sterling, because they aren't used to the league and Aspas is fairly new. Gerrard needs to take it on the chin and improve. Otherwise there is no reason why he should be starting every game.