[xtrumanx]

Presumably you told your co-founder after his email that you've actually secured $100k in funding.

What was his reason for not coming back was financial concerns and general uncertainty? I would imagine $100k would solves both of this issues for most people.

[qhoc]

This is just my guess: now with the funding, there is a need to increase time commitment. I don't know the financial situation of the other cofounder but with 5 kids, man, doing startup for little pay is not an option. I guess the salary is little to none in this case but require full-time.

[emmiechang]

He never knew we raised $100k nor got into YC (until sometime in the Spring of '14). It wouldn't have mattered. If you are in, you're in. If you're out, you're out. It shouldn't be conditional.