I think Walcott has ability and had moments that only players with ability can produce. Unfortunately, he has had many more moments where he has struggled to do even the simple things, which were always going to hamper his development. Perhaps, someone will be able to drill some of that into him. Wenger doesn't appear to be that kind of coach. He wants players to work it out for themselves. some players can, some can't Theo, imo, falls well and truly into the latter.
Of course I will miss his cringe worthy post match interviews.