I'd say if he has been involved with the planning of the business, the incubator application would have been on that road-map and I'd assume it would have been assigned to him.

Now, that could be your flaw in taking too much on yourself, and not distributing the weight properly, but you might take that as an understanding that he isn't taking full consideration of what is happening, who is doing what, and what he should be doing.

I learned this lesson myself a few years ago. I had a start-up that was getting a decent amount of traction, and brought a friend on board as co-founder to help with the marketing/biz stuff while I did the coding. I head to lead him around for months, until we decided he just wasn't taking the initiative and getting things done.

We've managed to still stay friends, and cutting early was the best decision.