Scott Allen
Trevor Allan (34)
How does the 10 cover his man & SBW as well. particularly if the 10 is not giving early ball?
I would suggest the larger defender goes high regardless of how SBW is holding the ball. The Tahs being a good example BB goes high & TC goes low?
You're absolutely right, #10 can't leave his man until pass has been made but I've noticed that the Crusaders often give the ball early to SBW to give him room to work in - if there's no early pass from #10, you're back to a one on one tackle from #12 but you're no worse off than if you'd just employed a man on man or zone defence in the first place.
The idea of the bigger defender going high is a valid one. Another way of putting it might be that #12 (or the man outside) always goes high (to encourage the offload back on the inside away from the defender attacking the ball) - in reality #12 will usually be bigger than #10, so same idea.