If, and I say, if, we are to try and trade in another key forward, then IMO:
(1) Crameri is not a KPF, but a third tall - don't need, even at the right price.
(2) Having watched Jesse White closely yesterday from Aisle 36 on level 1, he is not a FF, not all that great, and again - don't need.
(3) Gumbleton can play as a marking target from the square, and if he stays fit - do need.
Campbell was good yesterday, and with development, could be a solid marking target deep. But he is also a ruckman, and will progressively (hopefully) take over from Minson. Jones is a mobile marking target across the centre and half forward, Grant is a third tall. Crameri replaces who exactly? White is more of a Jones than a Gumbleton type, and I wasn't all that impressed with him anyway - only had an impact (slightly) when Swans broke away, but Morris had his measure most of the game. If Gumby is cheap, I would do it. Crameri and White - pass.
If anything, someone who can play both ends as a tall would be my priority (unless the fabled Fletcher Roberts appears at some point!!). And I think a big call may have to be made on Williams. If he stays next year, and is injured long term again, I think poor Tom's AFL career will be just about over. Alternatively, are there any KPDs on the market. I still harbour a faint hope that (on brief glimpses in his early games), Roughie could be a decent KPF/backup ruckman, although I don't object if he remains as a defender if there is no-one else.