I don't think it would make sense for the Dragons to be playable in Relink considering how early the events of the game take place in the overarching plot.

The theory goes once the archangel primarchs abdicated their control over the elements that paved a way for the dragon aspects to reawaken.

Inkwell_Obsidia said in comment #2393876:

I don't think it would make sense for the Dragons to be playable in Relink considering how early the events of the game take place in the overarching plot.

Welp, I ate my words.