Just to add to what JDW said, the story I've always heard from those around the situation was that after Toyota's Dome performance and subsequent buzz they started wanting to pull the trigger on strapping her, as she had always been a favorite of the brothers but had never been over enough to justify it previously. As for the night they decided to do it, it was likely indeed them just deciding to go for it. As bookers they were notorious for not planning things out in advance and just going with the flow hoping things would work out.
The way I've always heard the rest of the story is that when houses began to sag in the immediate post-interpromotional period, they decided to work the program with Kansai in hopes that it would bring gates back up. Essentially just going back to the thing that had been sorta working prior. However, as JDW stated, Kansai needed to get her win back from Aja, but at the same time they still wanted to roll with Toyota and didn't want her jobbing to Kansai. So they put it on Aja so that Toyota could be the big hero in the end and then restart her run from there.
