He's an exceptional athlete in any ones' language.so I cant see why he wouldn't carve up returning kicks for special team same as he carves up in broken field play. Would have been a star there if he went earlier IMO.
Other positions may be beyond him at his age. Will be competing against seasoned professionals that know all the tricks, plus a whole lot of hungry young'ns, that have grown up with it. However he says its been a long time ambition , so if he's been studying the game for a while he might adapt quickly.