Warning! Spoilers ahead for My Hero Academia chapter 340!
Mangaka Kohei Horikoshi of My Hero Academia just solved one of the many problems he made for himself with All Might's latest strategy to defeat the heroes' many enemies. Not too long ago, Horikoshi revealed he planned on soon ending My Hero Academia when there are still so many burning questions he has yet to answer before the conclusion of the final arc.
Just a few of the many issues he still needs to resolve - on top of starting and concluding the final battle - include the numerous loose ends regarding his supporting villains. The focus definitely lies on the two All For Ones - the original villain and another who's somehow simultaneously fusing with Tomura Shigaraki. But Horikoshi is so adept at creating compelling characters that readers especially care about that therefore it is essential that the stories of the other villains in My Hero Academia don't feel rushed when they conclude. Luckily, in the unofficial translation of chapter 340, All Might is demanding that the heroes isolate every member of the Paranormal Liberation Front aka the League of Villains.
This strategy will allow Horikoshi to give each supporting villain the proper amount of time and focus they deserve to conclude their stories. Of course, this isn't All Might's rationality within the story itself. The grounds for All Might's argument are based on separating All For One and Shigaraki because together they cannot be defeated. The problem, however, is that they are undoubtedly not alone. All Might correctly assumes that Dabi is serving as their vanguard, and since he can reduce everything to ashes, him being in close proximity to All For One and Shigaraki would just exacerbate the situation further for Japan's heroes. Dabi's isolation is therefore pertinent to the mission being successful. And since the logic is so sound, it makes sense to follow the same strategy for every other surviving villain.
Consequently, Dabi is also one of the supporting villains whose story fans are especially excited to see unfold. Quite some time ago, Dabi publicly revealed himself to be the lost son of the number-one hero Endeavor, who he and everyone else in the Todoroki family thought had died. Dabi's purpose for this unveiling was to help underscore the flaws of not just Endeavor but hero society as a whole. Since the already unpopular Endeavor was filling in as the official replacement of the retired All Might whom the public adored, he hoped that Japan seeing the true side of Endeavor would bring his father and hero society to their knees. His plan turned out to be quite effective as the hatred for Endeavor and heroes skyrocketed from that moment on. Obviously, Endeavor needs to confront Dabi as well as his son Shoto, who shares an emotional history with him as well.
Another villain fans undoubtedly care about is Himiko Toga who has strong ties with Deku and, more recently, Ochako Uraraka. Himiko has always had a thing for Deku and when she learned that she and Ochako most likely have this in common, she wanted to become just like her. Himiko achieves this by assuming the powers and forms of those whose blood she sucks like a vampire, which understandably caused Ochako to vehemently reject and denounce Himiko's actions as the villain had used her Zero Gravity quirk to hurt other people. Ochako's reaction wounded the villain exceedingly, so a situation where she and Ochako confront each other - maybe even with Deku - is quite necessary.
Even though All Might's strategy solves the dilemma that mangaka Kohei Horikoshi imposed upon himself, each upcoming battle wouldn't feel so rushed if they didn't have to occur at the last moment and one after the other, which is the likeliest way they will unfold. The only other option would have been to spread them throughout the course of a longer series. Of course, Horikoshi might be ready to move on from My Hero Academia, and rather than prolonging the story, he may be hoping to end it sooner rather than later.