I'll add that even Martial, who many rave about, has scored a total of 7 league goals. Falcao, who was realy bad (and I mean really really bad), had 4 goals. In most teams, if a striker scores 7 goals, he'd either be benched or sold.
IMO, the problem is the LVG system - it promotes defensive play and 1-0 score lines.
Back on topic, Re: Memphis: just how good is he?
On paper Memphis' physical style of play should be perfect for the EPL, however, I saw too many performances from him this season, where he does well against bad opposition (I don't believe that confidence is the problem, otherwise he'd struggle against low quality defenders), but the moment he comes up against a decent defence, he is completely impotent.
His best performances came against Midgetland, Brugge and Shrewsbury. Virtually every other performance, he has either been average or poor.
I think we need to see how he does under Jose. If he still sucks, then he'll be sold.