I feel like Sakura was supposed to be the original ending considering the bullshit Airi said in her previous interviews about gain after pain and hurdles in relationships and whatnot but they never expected this much hate that Sakura would get (which is quite braindead on their part ngl) so they might've shifted to Fumi just to boost the last volume sales a little. There aren't enough panels for a satisfying and conclusive Sakura ending, so it might just be shinobu stopping fumi in that scene and then washing away her insecurities. Sakuras future might even be kept ambiguous and she might not get that much screentime aprt from her breaking with ikeman.
BUT, this all considering they care about the readers, which, considering the past few chapters and how they handled the criticism for 129, I HAVE LITTLE TO NO HOPE.
Also, the most probable ending is the typical open ending that these shit japanese authors are somehow infatuated with. What the fuck even happened to good endings man, like if i wanted to see reality, I will just head the fuck out of my house, this shit needs to balance out my irl depression not enhance it for fucks sake lol.