I agree that our focus on bulk and stats should be that our CAP4 should be very inclined to be either all physical or all special, while still having the speed stat to pull of an effective sweeping/wallbreaking/supporting role. As for risk, again that would come from stats and typing. Giving it a a good amount of common weaknesses, but still giving it a few viable resistances. (As for weaknesses, a weakness to all entry hazards would make its life difficult)
I also agree that this pokemon should be able to pull of all 3 roles of sweeping, wallbreaking, or supporting, but with only with very specialized sets, and will have no way of having a Jack of all Trades set.
For priority, if we really want it, a move like Sucker Punch embodies risk. Though I agree that priority really shouldnt be necessary on this Pokemon.