Are you saying that dispel works in specials from heroes of other colors? I understand if this is the way it works, but I don’t understand why it should work that way. The relevant part of the special reads:
Dispel is not a status effect. Is it considered a “negative effect”? I don’t remember running across that terminology anywhere else. To me, it doesn’t seem like an “effect” at all. I think of effects as being persistent, not instantaneous.