ThomasBest way to defend 2nd is with a heavy. Don't believe me? Try it. Deny jumpers all day erryday.
You don't need to jump in to take the point though. You can push through flank or sewer or just tank your demo through choke.
Flank - run into point blank heavy? No go. Go through sewer? You're almost as far from point as when you enter from choke.
heavy ubers are also complete shit in an uber vs uber