(In.0 .. In.7) nMin | BestDev.0 .. BestDev.7
The priority is composed of three bits of priority (0 has highest priority), followed by one bit of ahead/behind local rover (0 means ahead, 1 means behind).
Walk a priority minimum across.
( C C C C C C C C ) X | X X X X X X X X
( E C C C C C C C ) 3 | 1 0 0 0 0 0 0 0
( E E C C C C C C ) 3 | 0 1 0 0 0 0 0 0
( E E E C C C C C ) 3 | 0 0 1 0 0 0 0 0
( E E E E C C C C ) 3 | 0 0 0 1 0 0 0 0
( E E E E E C C C ) 3 | 0 0 0 0 1 0 0 0
( E E E E E E C C ) 3 | 0 0 0 0 0 1 0 0
( E E E E E E E C ) 3 | 0 0 0 0 0 0 1 0
( E E E E E E E E ) 3 | 0 0 0 0 0 0 0 1