Perhaps you're right. I always saw Grom as too rash, which to me tells me he is more open to making mistakes. But Grom was also an insanely powerful warrior in his own right.
Also, I do know what you are talking about! Screwattack has a series on youtube called Deathbattle where they analyze two different character with either similar themes or abilities and then animate a fight between them (then explain their conclusion).
I think this would be a pretty good one for them to do, though I doubt they would pick two characters from the same game / universe.