The problem I would counter is that Hansen allowed the city the chance to look at OVG after waiting for 4+ years on his own MOU.
The city has constantly delayed his opportunities while waiting for the best deal. They also limited the window in which proposals would be allowed was short notice. AEG contended that the Mayor's office never was transparent with them (while their deal paled in comparison to OVG's) it setups the side that the Mayor's office is trying fast-pass this deal through without giving it the same vetting that Hansen has already gone through or will allow.
The right way to look at the merits of the MOU that is still standing with Hansen and not railroad it for another MOU on your way out.
The City Council can recommend (and I hope they do) that Hansen's deal is worth vetting against OVG's. OVG's offer is not a gateway to bring back basketball; it provides the NBA limited money as they would not own the building or the parking associated with events.
The same point stands for NHL with Hansen's arena too. I would love NHL and NBA in the city and if NHL wants to be stuck in traffic around Queen Anne, all the more to them. Don't block Hansen's plan as the city can support it.
Limit public money is at stake for both deals; don't kick one side over the other when both could survive.