Could you kindly provide proof for Toriyama's "significant" involvement?
Additionally, I realize that it is somewhat strange to equalize all video games to the same canon status, but involvement from Toriyama in the capacity of the franchise's creative owner alone does not merit a Tertiary Canon status.
For example, the hero is a character who is never heard/mentioned in any other Tertiary Canon (which is not the case for other Tertiary Canon).
Additionally, XenoVerse fundamentally modifies the DB cosmology, which is again, not hinted or acknowledged in the least by any other Primary, Secondary or Tertiary Canon.