As I think Cal Raleigh is the fifth and final prospect who is untradable, that means that I do indeed believe that Taylor Trammell, George Kirby, and Noelvi Marte are not untouchable. With Trammell, I could see him being traded since he just arrived in Seattle and Kelenic/Rodriguez are going nowhere. While he has been excellent this spring, his minor league hitting stats are not convincing.
Kirby and Marte I see as good enough to be commodities in a trade discussion for a star, but not good enough to be untouchable. If the Mariners were going to acquire a star player I would assume that Trammell, Kirby, or Marte would be the centerpiece of the deal.
As for Raleigh, he is untouchable because he has starting catcher potential and is showing it this offseason. Raleigh was excellent in the Fall Instructional League and is looking decent so far in Spring Training but has just 7 at bats.
He is also the Mariners’ only catcher in their top 30 prospects and they do not have much solid depth at the position behind Raleigh, Tom Murphy (Who will hit free agency after 2023), and Luis Torrens (Who has no minor league options left).
So, keeping Raleigh around to be the starting catcher of the future, or backup to a star free agent signing, makes sense. I need to see his bat in the majors before I would let him leave in a trade.