I was just watching a 16 star speedrunner on twitch, and they ended up failing the first lblj, but glitched into the 2nd key door to the right of the bitdw door. So instead of collecting both keys, why not just try to lblj into the 2nd key door without collecting the keys? And doing the other 2 bljs on the upper floors to reach bits?

you need to open the door to load either upstairs or downstairs, so you need at least both bowser keys to progress. there is no loading zone to clip into, the door is the loading trigger

Alright.

Sonicpacker Made A Video Explaining Why it's not possible to beat the game without the upstairs key.