As bad as Lee was, the placement of that line of training storms couldn't have been better.
The Susquehanna is the largest river basin in PA, with the widest river channel. Had that event taken place 50-75 miles east, the Delaware would have had to handle the brunt of the water drainage, to which the disaster, I believe anyway, would have been much worse
I don't know as much about western PA river basins, but I suppose that might have been worse, too.