With 3 founders and YC taking 7%, it will be possible to show that the person won't own 51% of the company and can be fired.
Again, this is for after, and there are other options, like being on a B1 or dependent visa while doing YC. You can own shares in that company and not derive income and at completion move out of the US.
But the question here is, how do you go about doing the ground work to even have a product that is competent enough to stand a chance?
