A couple things.... one I believe the volume is measured by shares, which in C's case cost 5-7 times as much as those of EIGH. So if C's volume is 20% of E's they're essentially the same dollars going into each. Secondly C's float is about 59M shares, whereas E's is 77M shares, only about 30% more, not double.
E is very close to being locked up. C is locked up + another 25-30M shares above and beyond what is currently on the market (air shares). E is still early in the game, C is nothing more than a waiting game.
Hope that helps things make a little more sense.