After Lambert's first season where, I believe, Gabby, Benteke & Weimann all got into double figures, didn't Benteke and Weimann both get awarded new deals? Gabby also got one this season and since then his performance has dropped too. I can't help but feel that those three have become too comfortable for their (and ours) own good.
Maybe a couple more attackers coming in, together with those being dropped here and there, will create enough competition to give them the kick up the arse they all need.