Depends as to whether or not Nathan Fillion wants to return.
It does seem rather strange to suddenly drag his character out after a 5 year hiatus and then suddenly upgrade him if they weren’t going to do anything with him afterwards, though. Hell, in an alternate universe, I would have been much happier if Buck replaced Sarah Palmer as the leader of the Spartan-IVs, but like I said, it all depends on whether or not Nathan Fillion wants to return, but if he does, I would be all over that (as long as they dont just kill him).