BDD has plenty if potential to more bosses in it. It's not silly in the slightest that it has so many bosses. 70% of the doors in BDD either dont work or take you back to other floors. They should all be made useful and add ghosts of other bosses in them.
This has some legs to it.
if i can jump your suggestion and adapt it slightly.
The 3 doors that don't lead to IZT could all lead to identical OKS set ups.
When OKS spawns 2 fake OKS spawn also. same everything aside from drop (give them a WG or WT drop file)
so you never know what room the real one will be in.
Guilds would have to try and get a handle on one of the rooms while sending runners to disrupt the other rooms/guilds in an attempt to find the real one.
Im not sure how easy it would be to code and ensure that atleast 1 real one does spawn.. even if it was a pre defined spawn room location/pattern that only the team knew so room 1, 1, 3, ,2, 3, 2, 1, 1, 1, 1 ,2, ,2 2, 3, 2,3, 2,3 2,,3,2,3,2.
and so on removing the random factor whilst still portraying random.
just a thought and have not really looked into it or thought of the negatives.
BDD being an endless cave would be a cool idea though. perhaps once you go through one of the "dud" doors you enter a random map of IZT/IKH/DD/IWT/KS and you must clear the boss before going onto the next level.
could raise an issue of too many X boss being killed so maybe introduce possible fake ones here too. i dunno just a brain fart,