You can certainly think Breden’s a Kryptast. But if you tried to “flip” xhim based on this assumption, Breden would say xhe’s already on your side, and quickly get defensive and angry as it became clear what your assumptions were.
Breden can come to the end of the game alive (and your companion for the next chapter, if you choose – like Kalt, Suzane, or Ciels). The only set-in-stone death in this game is (I think) your father’s. As pointed out above by @Norilinde, even Horion can make it to the end of the game without a death notice, with the right timing of his kidnapping and release.
This issue was noted about 300 posts upthread, and the answer was: