Okay so remember that one episode when Estonia really wanted to be part of the nordics so bad? and then that internet nerd is always saying those things to Finland cuz he thinks that fin can be so calm and yeah stuff? So I realised that Estonia didn't even approach Denmark the happiest among of the five. Denmark took care of Estonia for a while when he was a child but something went wrong idk why. But seriously Estonia knows that when he will tell Denmark about joining the nordics, Denmark will just be like "fuck this shit I'm out" pffft xD he's the leader y'know, and he's tired of teaching people about language and stuff.