I'm not convinced Goku can breathe in space. That's only something Frieza can do. In RoF Frieza took out the Earth and Vegeta died, even though he likely could have tanked the explosion.
What ifs can set parameters like morals on and bloodlusted. One where characters won't do anything they usually would do, the other where they would win at any cost. So unless it's a character who can fly/survive in space, every Dragon Ball character ever is just going to go for BFR, which is not really an accurate discerning of who's more powerful.
Anyways, Kratos was able to hold open Kronos' fist, with Kronos being a 1600ft giant with a clap force over billion Newtons, which would equate to at least 125,000 tonnes lifting strength. Not to mention he pushed back Atlas, who holds up the sky, which has no defined limit on how much that weighs. In terms of durability, Kratos is unscathed by Zeus's lightning bolt which casually shatters mountains.