Hi,
Well, I'm not sure.
If you have 3 dice allocated, and the "highest" is broken, the "lowest" still gets allocated and the "middle" one gets the other one.
If you had averaged the two lowest, then the still get averaged.
If you had averaged the two highest, then the lowest still gets the lowest dice, the highest has to dice separately, and the middle gets the left over dice! Which just happens to be the highest!
I think you have to think of it as allocating "roles" to the commands, which you try to keep as the battle progresses.
G^is,
JohnG