Also, forgot to mention. All the clones we see in Attack of the Clones sat down eating in the facility look nothing like Temuera Morrison. It's a different actor entirely.

The Episode 2 Visual Dictionary tried explaining this by saying something along the lines of "the growth acceleration led to clones that looked different from the original host".

Now I'm not going to argue about the fictional science involved in cloning in the Star Wars universe, but my point is, come ROTS, this was crapped all over, and we see that all the unhelmeted clones are played by Temuera Morrison.

So even if I did show Jango unmasked, the clones as we see them in AOTC wouldn't support Jango being the sole host. Not without an explanation from a supplemental book anyway!