[WillNotDownvote]

While having a co-founder might indicate you have trouble convincing people of things, or that you have no desire to do so, it's also the case that having a co-founder is no indication at all that you do have the ability to persuade.

I'd be willing to bet more co-founders than not are the people who happened to be close by and were the path of least resistance for each of them to move forward. Entirely possible there was no convincing, leadership, nor charisma involved.