He has 5 times as much as I do. This is reasonable because he's been working for over a year on the project (all pre-funding, thus on deferred cash) and I came in recently, understanding that funding (and regular salaries + health coverage) would probably come circa Nov-Jan. Obviously, if funding is later to come, I'm going to ask for more equity.

He's productive. I'm not bothered by his original decision to spend a month in San Diego. I think that's reasonable and I wish more companies were accepting of that sort of thing. I'm just annoyed about (1) the indefinite nature of his time away, and (2) the fact that I was led to believe it would be a month, not 3+. I probably wouldn't have called off my job search if I had known that the person who was supposed to be mentoring me was going to be spending a majority of the time away from "the office" in my first 6 months. At least, I would've waited till there was more stability before committing to the company.