But for the Reality Alteration, I say yes.
He fought Galactus, and Galactus is probably one of the biggest matter manipulator of all Marvel Universe, by the nature of his power, the Power Cosmic.
Onslaught can alter reality but his power also includes bringing forth object/creatures from the Astral plane into the physical world. I don’t know about you but I don’t regard this as manipulating reality……...not the same as Franklin Richards power but more akin to Nate Greys power.
This doesn't prove anything.Is ego immune to reality alteration? Is he immune to extremely powerful Telepathy?
Lets look at another of Onslaughts power. Gravity, magnetism and electromagnetism. All planets are created and affected by these forces, forces that Onslaught wields. What would happen if Onslaught cancels out Ego’s gravity field? How would Ego handle being split apart from the inside?
Franklin potential is to be nearly equal to a celestial. But Onslaught caught him while he was a child. So his potential isn't at his peak.
Onslaught easily withstood the suit designed to siphon Franklin Richard (Psi Lord) and Hyperstorms power, and destroyed it with a casual wave. Onslaught is way beyond Franklin power wise and evolution wise. Even Uatu acknowledges this fact.
But, since Ego is capable of creating Human vessels, he could just throw enough of them into the energy form and then destory it when it is weakened.
He better act quickly though because once Onslaught is able to spread and complete his evolution, Ego has no chance of containing anyone.
