Please, saying Josh Morris cant play wing is an insult to him. If he was the Matt Cooper or Jamie Lyon style of center then I would agree that he probably wouldnt adjust to life on the wing. But he can most certainly play on the wing and do it well. Just like Inglis can play center, wing and fullback, so can Josh Morris.
He'd be ok if he was playing outside Inglis against France but he'd be useless against quality opposition.
His defence is poor as a winger as his lateral movement is poor...he can tackle...if the opposition runs straight at him. any good winger can put a move of him and beat him.
He is also terrible at fielding kicks and he struggled on the wing for a while until he moved into the centres...if he was on the wing I wouldn't bother kicking to Hayne I'd just kick to Morris all game and wait for him to make a mistake.