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3:35 I actually found out from Kosmic That what is actually happening there in the lost levels is that Bowser's proper color did not load at that point so he's blue. He said that the proper green color doesn't show unless he get to the final part where you actually face Bowser on the bridge and he showed proof of it by finding a green koopa whose shell was definitely blue prior to the Bowser fight on the bridge at the end and finding that the green koopa who is blue actually turns green when you get to that part. So the change of color is actually a glitch or at the very least some kind of programming thing because of how colors work in the castle levels. Super Mario All Stars also doesn't maintain the blue shell on that first Bowser and just make some have his normal green shell like Bowser is supposed to.
Here's a headcanon about Bowser's great great grandfather being the only documented ancestor: the Koopa's and Toad's originally lived together and Bowser's great great grandfather started his own monarchy
My headcannon: blue bowser(morton bruce senior) is bowser's younger twin and he is the father of the koopalings. And he is dead. He's only encountered 3 times in the lost levels, never again! In smb and smb 2:lost levels you start with 3 lives Coincidence? I think not! Blue bowser never got any one ups and died permanantly.