Ok i had to go do some research on a Double Factor Dominant pied
this is what the page said
*Doublefactor Dominant Pieds: These birds will be marked much more like a recessive pied. Sometimes their bodies are almost completely one color (the same color that is on their head). Doublefactor dominant pied budgies do have iris rings. If you have a budgie that looks recessive pied but develops iris rings, chances are you have a double factor dominant pied. Like the recessive pied, the males of this mutation sometimes develop a pink cere rather than blue. (A blue cere is still possible in the males of this mutation.)
So with that being said and the lack of bars on his head, I'm saying if he was going to get iris rings he'd have them by now!,
I think he looks like a Recessive pied Male
I know all pieds are different but after looking at different pictures of the Double Factor Dominate pied - I say your bird has too much color to be one, Not to mention the lack of iris rings
all the ones I have looked at only have color on their back side between the feathers no where else. But like i said I know All pieds can be different
