Aye me either.
Watched him in 14/15 pre-season and he was poor, abject even. Convinced that was the end of him, surprised we kept him on loan instead of binning him.
But since then his rise has been remarkable, and he has to take a lot of the credit for that. From where he was to where he is now, that doesn't just happen, he's worked his nuts off in training to achieve a level adequate for Arsenal.