Yea, I'm going with the idea that once they digivolve they're in that upgraded form. Only difference might just be that DNA's can split apart.
<Snipped quote by Pyromania99>
My original idea was going to be two Digimon who were twins or siblings who played off of each other. So it would be;
Wormmon > Hudiemon > Lilymon > Rosemon
Wormmon > Hudiemon > Lilamon > Lotusmon
Since I can't do that I'm going for more of a "same Digimon species but opposite personalities" idea, and I'm still sold on the concept of double Wormmon. Fanbeemon would make more sense otherwise.
<Snipped quote by Pyromania99>
Going by Wikimon, Wormmon seems to be able to be any type if I'm reading that right.