If we ARE talking about potential here...
Wasn't SBP referenced to being more powerful than Anti Moniter? That would put him into high cosmic range as is. And 75% Galactus is speculatory, as no one really knows how powerful Galactus can potentially get. He could be Eternity's equal at 100%, or he could basically be the same as he is after eating a planet. There's never been an instance of him without the drain on his energy caused by Abraxas, so we really don't know.
Anyhoo, Reynold's is a beast, if he could use his powers. Wasn't it revealed that
Spoiler:The entire thing has me kinda confused. Potentially though, Reynolds probably COULD be a pretty powerful cosmic being, but he's way the hell too crazy.
Sentry is actually a creation of the Void, and not vice versa?