Wait, did they just reveal who clover is? Like the one behind everything?
yeah but not in the way you think, clover is her brother. Like its not the guy putting the letter in, cus that would be stupid, like clover is first of all way to smart to take the chance of being seen by yotsuha or smth and clover hates uchi, so thats not a reaction clover would have.
But He said they "look alike" and are "related" and Yotsua only has a single familie member who we know of, which is her brother.
So theory is that whoever gave this guy the letter was clover, cus of whats on the letter, and since he spoke of them being related, he also seems to know her brother or someone else that is related which makes it likely that person is clover, which makes clover increadible likely to be yotsuhas brother.
Also clover seemed to know about the clock, which her brother is at this point the only one we know that does as well.
Clover also seems to want to protect yotsuha or at least make sure she ain't hurt, but kill uichi which makes sense for her brother, if we say his motive for hurting uichi is being obsessed over yotsuha.
So yeah its more or less revealed now who clover is. In my opinion