Gane is very clearly as elite as anyone in the UFC HW division who isn't Aspinall or Jones. There's no one in the division who's even close to deserving a shot at either of those two. So then the booking question becomes which fight is most likely to provide some entertainment value while not being a complete squash fight, and the only problem with Gane/Aspinall in that regard is that Gane really should have at least one other fight first coming off of a major injury that could easily affect his mobility and kicking even after healing normally and fully.