A Theory About Vegetius

[Flavivs Aetivs]

I once posted this in another forum, as the user Renatus may know, but I once proposed that if Vegetius was writing after the Battle of Adrianople or another catastrophic Roman Defeat, it may be possible that his reference to the lack of armor and discipline may be because it takes time to resupply the army from the fabricae and to train new replacement troops.

I'd like to know if anyone can help with some possible legitimate evidence to support this theory.