In the cover 2 sink from 1-5-5 you can just reblitz the 4 players who are already blitzing by default. just put the DT over the Center, one of the lb's in the a gap and place the last two blitzing lb's over the tackles and get the same effect with more coverage.
Your theory still works for bringing heat in different directions but not as much coverage. But in the end theres still nothing better than seeing the qb with his butt on the ground.