He’s coming, let me tell you how

Theory time

The sun is abnormally close to demon world 1

Saiyans use sunlight reflected off moons to turn into apes, vegeta says its sunlight reflected off the moon & that’s how he created the orb to turn oozaru, by a power orb mimicking the moon, not to mention all the other very close moons in other demon worlds

They need blutz waves to do so. But they also need a tail? No, vegeta turned SSJ4 without a tail (instead of blutz wave generator, use magic)

My head canon is the namek that’s going around with them is actually Zalama (the guy that made the super dragon balls) because every feat he does piccolo is shocked. This is a huge stretch, but supposedly daima will tie into super in a big way

And if he’s not zalama, I think somehow he will return goku’s tail, and episode 18 will be him turning into a version of super saiyan 4

I also think SSJ4 will have black fur & the same look beyond that.