I would remove them as a unit, then when you reinstall everything, leave out that top "hidden" bolt.....I've done this to all of mine and it still works fine.
You may have to grind a couple of small notches in the front of the tcase coupling flange (for tranny shifter housing clearance, when slipping the tcase on the rear of the tranny). You'll see what I mean, if you run into a clearance issue. Make the mod, before you reinstall the tranny.....much easier to check for clearance.