On their own? Never.
But the OP specifically said that they could stack their powers. Hulk is a match for Superman (and so, could beat the crap out of most other DC bricks in a fist fight).
Surfer can match Hulk (sometimes).
So stacking their strength (and ignoring everything else)? And then add Shaw's ability on top? And then add Darwin's 'I can be as strong as I need to'?
You used his teleporting away during WWH as proof that he has limits. Which is wrong, it only shows that that is what his mutation deemed to be the safest course of action to take.
Subsequent to that showing, he has now shown he can take on more offensive powers, and can actually choose his powers.