I was looking around this leaderboard, and also on Speed Demos Archive, and noticed that the SDA run is a 2:38:01 done by 0xwas, which destroys the World Record, and his Personal Best. I'm wondering what the difference between the power on timing we have here and what the SDA timing is, because there's only like a minute between player control and power on.

i think SDA timing is start on file select and end on smithy 2 death

SDA timing is from gaining control of Mario in Bowser's Keep to last hit on Smithy 2.