The Suns' cap number would be based on the 5 years, $172 million. When they say it could be as much as $207 million, those are entirely in the form of incentive bonuses, which are triggered by things such as making an All-Star team or an All-NBA team or winning an NBA performance award, and which do not count against the cap. As such, IF the issue is not allowing the bonuses, the only thing gained there is money in Sarver's pocket. And if the issue is that Sarver won't pay Ayton the $172 million, it begs the question as to why Sarver thinks Ayton is worth less than SGA.
That's not true. If he hits the escalators then the contract changes and those changes need to be written into the deal. The cap will most definitely change if he hits the escalators because from that point forward they aren't bonuses and its guaranteed salary.