I'm not sure what the rules are for a stand-in, but imo the best stand-in candidate for Fnatic is Xeta (assuming they can get players to fill from other regions)
Fnatic need Sova, Bonecold doesn't seem like Fnatic need and Fnatic doesn't need IGL. for Bonecold To be honest, other than experience and IGL role, Bonecold isn't good enough to play for Fnatic.
bonecold plays sova, and before becoming IGL he was so good for acend, even constantly top fragging. And some pros have told that he was the best aimer in acend, just that we couldn't see that when he became IGL, I think he will do fine with fnatic if they pick him