Oh yeah I'm certain Koeman had a big input on Pelle's signing, and he may well know how to get the best out of him/like him a lot. But I really hope we haven't seen the best of him as nothing I have seen so far has really convinced me that he is anything more than an average to poor PL striker. Off the top of my head I think basically every team in the PL has a striker I would prefer to Pelle. My other slight fear is that Koeman likes him a lot and continues to stick with him even when he is playing poorly, but I have nothing to found that on atm.
I'm not saying sell him as he will be needed with the extra games next year, but if we really are going to be that top 6/4 challenger the club keep talking about we need a striker far better than Pelle.