I just assumed that was because of his bucktooth arm-eating grin, not because of a perceived lack of technical ability
But no, there is probably nothing inherently unfitting about his qualities and his inconsistencies with regards to the striker position compared with other strikers. I just think you wouldn't really want him as a striker if he is out of form due to that, but I wouldn't see him on the wing either in that form so it is sort of a moot point I guess.
Mané always reminded me of Nani but he should surpass him soon, if he hasn't already.