It's all craziness out there in the portal. Guys constantly evaluating their standing with the team and figuring out their options for playing time and NIL dollars - and it's happening in all sports.
UW is having some major issues, but it's a damned if you do and damned if you don't situation. Using DT as an example, they had 3 guys graduate, so needed a starter and depth and you go looking for a couple more guys in the portal and then the remaining guys start worrying about their spots and guys like Willor and Howard who didn't start and weren't major role player worry they might not get their share so they hit the portal, and the whole thing repeats itself.
UW has had 21 guys enter the portal, and signed 16 new portal guys - mostly a swap of comparable quality guys. UW is not an outlier. Take a school like Forida State who had a mediocre season despite beating Alabama in their opener. They did not fire their coach. As of right now, they have 7 incoming transfers from the portal and 34 outgoing transfers. They are going to have to find 20 more portal guys just to fill out their roster. It's craziness.