Major Tom's enlightening contribution on Frontage Frontage Primer, and Questions shows that leadership greatly influences Frontage. Basically, Frontage determines how many units will actually fight on one side at the same time; the more the better. But, unless I've missed something, it leaves one question open.
Since all the units in a region at the point in time that the battle starts are eligible to part take in that battle it should play no role whether units are in one or multiple stacks when Frontage is determined and the battle is played out.
So for an example assume a corp with one division in it and a second independent division, with an extra general so that it is not under-commanded, are moving along the same path. Both the corp and the independent division encounter an enemy corp in a region along the movement path, through which a battle develops. Assuming that when the battle starts both the corp and independent division are in the battle region, will it make any difference that the independent division is not in the corp stack?
The Frontage rules seem to say 'no', but I've never seen a conclusive answer to this question. Anybody have an answer or thoughts on this?