Moved the delay frames elsewhere. The spot I chose is before the door object itself loads, not the short spot of floor leading up to the door. The exact position is when we landed on a platform, where if we insert a single blank frame, our two frames of not moving right would overlap with one frame of landing lag, so that the one blank really does mean one frame delay, not two.
We are now delayed 7 frames due to frame rule. I adjusted the boss for the case where we have zero frame delay on the frame rule, so I eat the 7 frames before loading the door.
Animation frame rule after the boss is still 1 frame loss. It is nice to know the slightly different boss timing could have tolerated killing him one frame later, but we're fine either way and didn't need that tolerance.
Was this the thing needed for sync?