I liked how in the last episode they just dropped all the pretenses and Wash became, from voice to dialogue, Church. They've always been similar, but now they're practically identical except for the fact that Washington can shoot straight.
I did notice Burnie's voice in there, but I think he was one of the bad guys. Still, both Church and Wash have always served as the movie-the-story-along character, so in that regard they're similar.
(Except for the very end of it. You can match velocities and catch people with an airplane [especially if you don't care about G forces] but not with a car. If they can be caught by a car what difference would it make if they just hit the ground? It's the same Goddamned thing.)
I noticed that too. If you want to rationalize it, I suppose the give in the car's trajectory through the air might be enough to "cushion" the landing. It's a stretch though.