Thread:Marcusbwfc/@comment-38329135-20190130213540/@comment-4370375-20190130214743

If I had to assume, it'd be because X Antibody forms would be treated as a one-way Slide Evolution rather than an actual Digivolution since the level doesn't change and the X form basically replaces the original in that level's slot.

Kinda like how Agumon in Digimon Next presumably went from Classic > Greymon > Belt > GeoGreymon with the latter two permanently replacing the former two.