A much better more productive player?
Only in the moments when he's not being erratic and unreliable.
He's been rejected with good reason by the last three clubs he's played for.
He'll be good, maybe great, for a couple of months at Spurs club before rediscovering his talent for alienating team mates and managers.
As for it affecting the Nasri situation - probably not, if City want them both they can afford it.