I've come to accept that he's going to have to be paid at least as much as Niasse in on.
I don't think he has it in him to drop the shoulder and beat a man, or to create something out of nothing when the team is struggling. He's a good athlete who is improving where he can - most notably with his movement in and around the box - but I don't see the makings of a talisman who is going to lead the line in a successful team. There's also the issue of whether or not he can function as a lone striker, considering how long it's been since anyone won a trophy or even qualified for the Champions League playing 4-4-2.
Overall, I think he's OK, but if the club is going to hide behind the wage bill as an excuse for not bringing in better players, fans are going to question why they're sanctioning bumper paydays for the current crop.