quick correction...RD's have a 90% chance to resist valor from any hero (excepting the veteran, because he is colorless)...10% of the valors targeting them will have an effect...
result, if you have more than 10 AP boosting heros (not counting veteran) chances are good you will have a boosted attack, though RDs don't really need the primary attack boosted (it would rock if it boosted secondary attacks...but hey, ya take what you can get)
my suggestion is that if yer playing heroes with red, use efreeti, they have much lower resistances, my efreeti have gotten over 8k primary attack already this reset in megablitz