>>57335908Holon's don't seem any different except being able to be energy. The Delta Species also seem to, at best, have a colored aura. Their weaknesses also imply that whatever type shenanigans are happening is separate from a straight forward type change, though "type" in the card game is always kind of a vague concept compared to the games.
Nowadays, of course, they would definitely look different and be a fully different type. But it's interesting to see something like this being floated so early in the TCG. Like with things like Megas being preceded by Lv. X and so on, it's clear the TCG, at least before the last few gens, was allowed to experiment a bit in a way the main games would avoid until recently. Resulting in them trying out similar concepts and gimmicks that the games themselves would eventually think to try too.