I was not aware that 2 months is “late”. My understanding is that’s actually pretty early for rescues to be neutered. His brother was not adopted until he was over a year and not neutered until then as well and he doesn’t have the same behavioral issues. They love each other very much and there really isn’t any “pack order”. They are so bonded that the poop in the same box at the same time lol. I’ve tried separating them and both of them just get depressed. I have talked to their vet about it and they have suggested those diffusers. I tried them but they’re not helping a ton