Last episode of season 7

Can someone tell me what was the point of flying Harvey to Chicago when he barely helped (didn’t fill up paperwork correctly so couldn’t take the case) then went back for Mike’s wedding ?

I know how important it is for him to go back for Mike’s wedding just that the whole episode seem rushed considering they had to show Jessica’s side as well but what has that got to do with the plot? Or was it just so the spinoff Pearson makes more sense? I haven’t watched the spinoff so I’m not sure