Hi Mike - my bad with the regular thingy. That was a hangover from the PIP allocation.
On a full reading of the Baggage rules (which I should have done first time) : "Each general has 0-2 elements. An ally's must, and other general's can, remain with him as Command Baggage. All other baggage is held in common as Army Baggage. Each non-allied command without command baggage shares the effects of Army Baggage and it deploys in I of them."
So my (deliberate) interpretation of this is that a sub-general can contribute to army baggage, but only non-allied commands get the benefit of army baggage. Why anyone would do this is beyond me, so I believe this is effectively a dead issue.
So I stand (happily) corrected. Sorry about dragging it out!!
Cheers
Andrew