This is an area where transparency would help a lot. Let's say, just as a hypothetical (I have zero inside info), Maliq really wants to stay and the coaches really want him to stay... But he knows he can maximize his earnings by portalling, and there's a real chance these next two years are his highest earning years. Anyone giving him good, honest advice will tell him to go get the money. The only way to do so is to go see what he gets offered.
On the other hand, if NIL was fully transparent and coaches could get involved openly, Red could say "We'll give you the average of the top 10 portal power forwards," or something like that - and maybe that's good enough to get him to stay. Almost like a franchise tag in football.
The lack of transparency is likely causing more movement.