I call BS and say he just made that thing using the data he collected from watching Kouta fight in Kiwami and watching Roshuo fight.
Sagara saying that "no one can stop a future in motion" has me thinking that the golden fruit will be turning Mai into the blonde Mai lookalike we've barely seen since around the debut of Kachidoki, and she'll be using its power to project her mind back through time to try and prevent all of this, only to instead just play out the role we've already seen her perform.
preview spoiler:
Spoiler
and I'm calling it that Micchi dies in Kouta's arms, though I can't say for sure if he'll get redeemed before the end or not. I've pretty much been expecting him to go out like that for months now.