We watch Alexis play and clearly see he is best as a right attacker.

Alexis thinks his best position is on the left.
http://www.ibtimes.co.uk/arsenal-sta...t-left-1474610

He not smart. And it's becoming clear he not that fast over longer distances. (He is very quick over short distances and has great acceleration)

His movement ain't that good and he doesn't anticipate moves well.