Yeah, I can see it being a healthy contest between those two as to who should be the first choice.
Gray and that Kamoah lad have only got one year left on their contracts. Get both of them, and Abraham on loan, and striking options of Gayle, Gray, Abraham and Kamoah for maybe 15 million would be ok for a first season back in the premiership. I'd rather we went 5-10 million more and got someone whose proven to score 15+ PL goals, but Abraham, Gayle and Gray have all hit 20+ in the Championship, and i'd imagine it would be good for competition as none are clearly better than the other so you wouldn't have someone who expects to start most/every game. It would also free up some money to spend on midfield and defence which is sorely needed.
We don't need four strikers when we are only going to be playing with one
Kamoah is only 18 so is more one for the future, and he can play out wide as well apparently, so it would really be 3 plus him. If we're going for Gray I'd ideally like Abraham as well, otherwise we'd still need Mitrovic.
Typed Kamoha in to google as I was trying to figure out who this lad is. Got some interesting answers.