When looking at the schematics from
https://chicagoyimby.com/2022/04/potenti...n-lake-shore-drive-in-streeterville.html
I didn't realize that the footprint for the south tower is actually larger than the north, even though it is shorter. There is also a little more space allocated to the site. This makes sense to some degree as the south tower was originally planned as the taller one.
Still optimistic that eventually the south taller could be taller than the current design - at least the space for it exists.