I always assumed at least some was coming home.

I also think the US has a lot of politicians who have been grifting in Ukraine. It seemed really strange how Zelensky would boss around our president and our Congressmen. He should've have been humbly coming begging for crumbs but instead would make comments like "don't show up here without bringing this and this and this". This suddenly makes sense if Zelensky is blackmailing a bunch of people in the US government. He knows what crimes they and their families have committed in Ukraine. He knows what crimes the US has committed in Ukraine, ie. biolabs doing illegal experimentation. He gets money or he exposes their crimes.

Of course most likely he is blackmailing and allowing kickbacks. The best way to control people is with both the carrot and the stick.