Just on Gaff, at the game today I watched him a fair bit because I've got him in RDT, but I noticed that the new rules have pretty-much bypassed the need to have a number of loose outlet players from 40-70m out.
The entire defence gets pushed back at the kick-in so your back pockets and KPDs are at that area where the second kick used to go, which was generally to a wingman playing on the defensive half of the ground. That used to be Gaff's area where he won a lot of the footy, but now he's not needed nearly as much.
Basically he hasn't become obsolete, because teams are still using that kick, it's just far rarer that they do use it because the area is generally packed with players so there's very little space. He might need to reinvent himself, but at this stage he's an easy trade-out for me from a DT perspective.