It seems like the entire point of the Adversary talent is that it emulates lots of other talents but does so with one easy to remember number. A starship with Massive 2 is big. A starship with Adversary 2 has plot protection.
I was thinking yesterday that it might be better if Adversary just generated one auto Fail rather than upgrading dice. The rules mentioned above would match that by making it also generate 1 Threat but only to cancel Advantage used against him. I'll have to ponder this a wee bit longer.