It seems to me, there is no harm in re-holding this discussion. ESPECIALLY since this year's game had at least TWO unique (and somewhat subtle) design considerations which come into play here.
The fun one:
Ever wonder why some teams can hang more of their robot off the bridge than others? CG is only one half of that story... Support Polygon is the other.
Can you think of a situation in which an (evenly spaced) 6WD would be better for balancing than an (evenly spaced) 8WD?
The boring one:
Also of course, the number of wheels, and ground clearance play a large role in the bump crossing design challenge.
Perhaps some of the teams who used 6WD or 8WD this year could share their justifications for doing so, and how the unique design considerations of this game came into play in their decision making?
To some of us, the process is the most interesting part of this competition...
-John