I think we dodged a bullet getting this lad instead of Zaha.
We were not Zaha's first choice club so who's to say he wouldn't have done the same thing to us in twelve months time? But if he did stay he will be 27 in November so a player who's game is based on pace will devalue considerably at the end of a long contract.
Iwobi is younger, better at tracking back and will appreciate in value. Yes he has faults, but he is young enough to learn. The good thing about him is that he is not afraid to take players on and he will get supporters off their seats.
As for value. He is a direct replacement for Lookman according to MS, so if we got £22 Mil for him and are spending an initial £28 Mil for Iwobi than you are looking at a net spend of £6 million for this kid.
Ultimately if we do end up paying more in fees it means that the club and him have been more successful.