I see a communicator there.
To me, that looks just like Ford, what you can see, so I always assumed it was Ford... It was definitely Han's idea, but it's totally plausible he sent some random schmuck up to do it too, so if that is a stache I could go either way on the scenario then I guess. It really looks like he has a hood on under the helmet too which is weird... I forget if the pilots we see close-ups of look like they have a hood on too.
Now on the debate of the guy chucked off the AT-ST, people can survive big falls... I'm saying broken limb(s), maybe broken vertebrae... lights on his head and a broken neck I suppose. I think it's a survivable fall though under most circumstances, plus it's not moving till after he's pitched off it.
the Ewoks though... yeah, well if they find him, who knows. I still have to wonder, would the Alliance have intervened on the Ewoks eating prisoners? Or would they just let that stuff go?