Idea guys: get your partnerships in writing, at least emails, so you're not relying on photos and verbal agreements for your case.

Implementors: beware 'idea guys' with inflated senses of their own value, and who may not have the skills/staying-power for all the detail and drudge work ahead.

Unless Brown is a total fraudster, I'd guess there was some legitimate contribution but then early falling-out. (The complaint identifies a contentious phone call in mid-August 2011 as the turning point.)

Assignment agreements and founder-vesting schedules exist for these kinds of cases... but given the speed and informality of today's ventures, can arrive too late to save teams from ugly court disputes.