The Alt being equal to a Main is largely a function of the CSM evolving itself through tweaks and innovations. The whole Main/Alt distinction was created when the CSM was a pseudo-parliamentary body, and Voting Mattered. Alts didn't vote, and in a CSM focused on shovelling bullshit from the Assembly Hall into a wiki that no one ever reads, the Alt/Main distinction matters.
Today, when most of the 'CSM Work' happens at Summits and in persuading devs on Skype to do what the players want, influence is a matter of bothering to communicate and doing it effectively. So alts like Two Step who are around and participate a lot can do much more day-to-day than a main like Killer2 whose AUS timezones and RL situation mean that he can't do much.
CSM6 has a weird core of people who are constantly busy and do a shitload. There's pretty much a group who's always doin' thangs and a few who do essentially nothing (or literally nothing, in Prom's case). Thankfully the busy group outnumbers the stragglers who don't contribute.