Part of the reason Minoru Kidooka said he wants to wait for Daisuke Ishiwatari to complete GG’s story before considering a crossover is because he respects artistic authorial intent.
It’s like waiting for a painting to be finished before working on something else related to the painting.
Or expressing a message without adding extra noise or going off topic.
Even if money and executive power afforded them the ability to retcon anything and everything in Daisuke’s works, it’s because Kidooka values those works that he lets Daisuke do what he can to the extent THAT he can.
Unlike other game companies that have a history of breaking their relationships off with creative game developers once the cash rolls in, ARC System Works has established a history of exactly the opposite: valuing talent and using it and allowing it to grow and finish what it started to create.
I don’t want to make Kidooka sound like an angel from heaven here, but he values talent for it’s potential and made an investment on that potential. Certainly there have been mistakes now and then as history shows, but so far in the long run games like GG have been successful because artists like Ishiwatari can express themselves with freedom to do so.
So next time there’s discussion about game crossovers, consider the intent of the game authors and what they really wanted when they made their respective games.