Thanks for your comment.

I think the time when they still have awkward feeling toward each other, the overlap is still a SELAM type - not many interaction occurs here; that's why, without a lot of conversation, they assume they can't align.

But as time goes on and as they interact and converse more and more, they realise they have more commonalities than differences. Their structures draw closer, BFF overlap occurs, and they become best of friends.

I hope this makes sense!

Thanks once again!