Is it possible that we have lost a considerable amount of early material that was never collected in the Theravada Canon that was preserved in other canons and is perfectly valid?
Also assuming something isn’t early material, does it stop being valid for use?
Well, I was actually trying to make a point. There are a lot of true things that aren’t listed in the suttas. Just because a specific god is not listed doesn’t mean they aren’t real.
Completely agree. That said, investigation of such deities may in the end be unprofitable and it is one of the natures of the Dhamma to be a refuge, possibly from the fruitlessness of exactly such endavours.