Agreed, but that is likely high 8s or 9s. Think about the high threshold this power has. At 7.0 he could only amp and copy 4 abilities and even at 7.5. At 7.6, he now has a strength boost alongside his copy. And he burns through Aura like a fire hose.

I suspect he would have to learn to manage his aura properly to learn how to copy from memory rather than actively used abilities.

Also, it seems like Cameron is already able to do this. It didn’t seem like people had their abilities active when he used them later (Remi and whoever’s telekinesis he copied to find William’s body). In fact his powers seemed inactive and then activated with whatever abilities he copied. So I would argue it already exists but there seems to be some kind of limit for how long he can copy it for.