Given he started later - only in the Spring (he found them when they already existed and they launched in July so they must have made it quite a long way before he arrived) a lesser share seems reasonable especially as to make something someone will have needed to put up real cash in addition to free effort.

But you are right that he should push for a response.

The other thing that seems to be missing from all these founder/first employee discussions is the level of influence over business direction and strategy. Some people may not want these responsibilities but others would relish the involvement.