Yes, I know.. from the EU. But doesn't AOTC present contradictory evidence to the fact of them being drawn from the Stormtrooper ranks (which would have been the "clonetrooper" ranks from Kamino at this point)?Kurgan: they're drawn from the Stormtroopers.
Our only visual sight of two Royal Guardsmen's faces. They looked very similar. Their probably drawn from the clones in general if they're all clones, or the "crack troops" clones in Wong's theory.
If the canon and the EU contradict, which source do we look to?
We could I suppose, retcon it like we might the Stormtroopers:
Well, they're not ALL clones, some of them are recruited from the general non-clone population... or these were the "best trained" clones or something, or heavily modified to be even better clones...etc etc
Or when we see them in AOTC they're NOT clones, but they're later made into clones (a reverse of a stormtrooper theory: at first they were clones in the prequels, then they added non-clones in the classic trilogy, so now they are mostly recruits).