WAHHH GREAT QUESTION. i agree, re: babying and babied chan. i think chan really changes things between them. he makes binsung so much stickier than they are when it's just them. 3racha is really its own solar system in a way, right. all these inside jokes and established dynamics that feed off each other plus their aligned work flow and goals. binsung are way more bro-y and less careful with each other when chan is there -- like i think this is a more authentic peek into how they are with each other off camera than them interacting one-on-one, simply because chan alleviates the expectation and attention of any moment they're stuck in together. chan is SUCH a good temperature gauge because he can sort of... steer them at times. if jisung is going too hard, he can reel him in or if changbin is moody, he can tease him out of it. not that i think binsung are incapable of that on their own, but things are SOOO much more malleable with chan there.

changbin is way more willing to indulge chan than he is jisung, and jisung finds it really easy to be sincerely obsessed with chan in a way that he could never be with changbin simply because the embarrassment would kill him. i love love when binsung band together to tease chan. i think changbin is much more likely to following jisung's directive in a 3racha setting, like when jisung ropes him into messing with chan. changbin doesn't initiate a ton of that stuff, but he will go along with it, and that's such a sweet spot with both jisung and chan, they both really love when changbin plays along with them.

actually i just ran into this video because i'm rounding up all my binsung tweets, but during a stage game jisung gets annoyed because changbin can't guess what he's saying and he goes to jokingly choke changbin out, and changbin looks at CHAN who is sitting there watching them and smiles at HIM. like idk, it's like a electric circuit where the current has to go through all the parts to make a full loop, they're just in tune with each other in a way binsung on their own struggle to be.

as a trio they've really practiced and learned each other's boundaries so they can figure out their work and interpersonal flow, and i think that does bleed into binsung's dynamic as well because they understand the work they have to put into understanding each other and it's worth it to do that. it's just that binsung on their own have different approaches and expectations, but chan bridges that gap with his understanding of them both.