A few facts.
1..Kai is at best a fringe player competing with many to tryout for a team
2 fringe undrafted players really are in no position to demand ,
3 the SL has standard set pay , SL deals are not negotiable. It's take it or leave it.
4. It follows that each player representative is in communication with teams that they're trying to get a deal with. Obviously the teams know the sentiment and conditions communicated by agents for their clients . Like no team will invite Cooks if he already communicated he wants a guaranteed deal not a try out, via summer league.
A fringe player who's agent is demanding like Kai does not fit the profile you give a SL invite to, of course don't count players who were drafted or have deals secured of course they are automatically entered into the SL
Essentially SL for those who don't have a contract yet is like a walk in tryout for school teams (obviously they at least should be invited), like school tryout walk ins, they don't have a scholarship offer deal secured yet. . It's tryout at your own risk..
It seems Kai's camp wasn't wiling to fight it out as a simple walk in, but had conditions for a secured deal in place.