The balance of back row, like all parts of the team needs to work.
Willis doing the hard yards, Pepper the rucks, leaving Hill to work out wide is great, but only if the ball is getting wide, where the forward can make good yards in contact.
The game plan needs to be clear and then pick a team to suit.
The issue with SB is that no one likes his game plan and so he picks players by media selection and then tries to fit them to his game plan.
If he want to keep it tight, then pick a big pack, Ford at 10, a big 12, and 2 big wingers to punch holes and to compete aerially.