Dude, I just posted a cool video ;-) I'm not a spokesman for SpaceX.

Disclaimer out of the way...

I sure hope the percentage of fuel used for landing is somewhere south of 50% ;-)

I'd say that your second question is interesting when I think about that thing finally operational. You'd think that at some point coming back from orbit, there's an aerodynamic regime in the middle, after the fireball phase, where a parachute would be an effective way to slow down, before you fire off the expensive rockets for the final touchdown. I don't know if they're doing it, but I hope they considered it.

If they did, it would look a bit like Curiosity. At first I didn't think there was much comparison, but thinking about how a parachute might work does make the resemblance to the parachute-then-skycrane profile more obvious. Yeah, it could work. Maybe even better in a thicker atmosphere.