Binchois
Too many words...
There remains a glimmer of doubt in the case of one MG firing (say, a BMG); followed by an in-hex MP expenditure (to delay or to change TCA, for example); followed by an attempt to fire a different MG (like the CMG or AAMG).Rule C5.3 says: "A vehicle with a Multiple ROF may not fire again until it has expended another MP (even if only a Delay MP)."
However, the (non-MA) MG can't get ROF.
So I honestly don't see where the confusion is.
Is this legal (because the tank hasn't yet left the hex AND the shot is not simultaneous with the original MG shot)? Or illegal because the MGs are required to FireGroup? This is the ambiguous case.