I'm going to try....
3hr A 30 min
3hr uncapped
4hr into bed
I think maybe pushing him to 9:30 if he wakes at 5:45/6 again will make him OT with a capped nap so try this and see if we can get a later wake up and slowly push out. At least I have a plan even if it all goes wrong and have something to tell the IL's. Have a good weekend!