Would he want to come back? We always say we don't want to keep an unhappy player, and maybe he'd prefer to stay in his homeland at a club where he's been a big success.
I don't think it's 'short memories' he simply got better the more he grew into the PL and the more he got more accustomed to it - a bit like Ali Mac.
On the other hand if you want to have a go at those who wrote him off as 'not up to it' at the start of his Albion career then fair enough.