I didn't say that you assign one guy in every situation. What I said was that when Dom was on the perimeter, he would have been the best option because he was never the guy taking the shot. Obviously, if he was on the baseline, he would not be the guy.
Most of the problem is the fact that he's on the perimeter all the time to begin with. He should be running the baseline, cutting through the lane, setting screens, swinging the ball and moving. That is what SFs do. I think Coach wants to use him like Brownlee,but he just doesn't have the skill set. Brownlee could hit the open three and had the size to be a mismatch on any guard and quickness to be a mismatch on any big.
When Dom is on the perimeter it makes it tougher for every other player on the team, because his man doesn't have to respect him out there and can close gaps for Jordan to drive through or cheat to the nearest shooting threat. If he's moving, he's a threat. He is one of the best athletes in the nation and a threat to finish an alley-oop or to dunk it on someone if he gets a good pass and the d is sleeping.