1) You would think so, but we also don't know. Maybe Ishbia would want more control from the development whereas right now the proposal is basically just Related giving JR the land for the stadium and that's it. Maybe Ishbia negotiates for ownership of the land around the current stadium and just builds that up to a stadium district. Maybe he tries to buy the land at the 78 from Related. We really don't know.
2) Mansueto seems to be looking to build at the 78 with or without the White Sox. It was reported in November that he had narrowed his choices to the 78 or Lincoln Yards, but the 78 would be much easier from a zoning and community input perspective.
3) According to Related, yes. Especially now that the U of I facility that was supposed to anchor the southern portion of it has been cancelled.
4) Part of the Related pitch for the Sox stadium at the 78 was to repurpose it to a soccer stadium, but like I said above, Mansueto doesn't seem to be looking at it. However, the Chicago women's soccer team is looking for a new stadium in the city. If they really want their own stadium and don't want to partner with the Fire, it could be the place for them.