Although we actually improved after he left, I'd take him back in a heartbeat! Our midfield consists of workhorses without creativity. We got no AM's, and i think it prevents us from adjusting our style when needed. He could play as a left forward too.
It could be argued that our hardworking midfield adds to our defensive record, but like today, every now and then I feel we miss a link between midfield and attack. And that must also have been the reason why we were after Fekir in the summer.
I can't see it happening though. He will most probably bounce back in Barca, besides there's no way we're gonna pay anywhere near the amount we got for him.