I think you’re missing the human element of this. He likely wants to play.
According to Hoop Collective the Wizard preference was based on them being the only team truly interested and it was more of an after the fact thing, not something Trae/Camp predeterminedHe may opt out and extend at a lower number. Trae seemed to indicate he would do whatever the Wiz asked. Trae had the Wiz as the preferred destination. I could see them telling him they will do like a 2-3 year deal around the 40M mark if he opts out or maybe they tack another year on his deal after he has opted in to the 49M next year. I would bet they already have outlines of what it will look like.