that's literally one of the strongest arguments as to why they shouldn't be together. Akane pretended for some years to be Mei doing everything as Mei in order for Mei's lover to get over his grief. I understand he's trying to imply that Akane's efforts shined through while being Mei and he fell in love with Akane through this method. Yet what does he actually then know about Akane then? He dated Mei before and didn't have a close relationship besides being a teacher to Akane. He literally knows nothing about Akane essentially. How did you fall in love with someone who wasn't their selves for your sake? Obviously this is fiction so the reality can be ignored, but it's so lacking but you can't deny how absurd someone would be to think they're over a death by dating a replica of the one they loved.
Wait, so the seme fell in love with the uke while they were together... while he was pretending to be his brother. So the seme didn't fall in love with the uke, he fell in love with the uke pretending to be someone else. He doesn't even know the ukes real likes and dislikes.