Sounds like you are a lucky one with sociable cats. Cats do sense who is cat-friendly too and this helps their adjustment, but I think
some loved cats (and I can see yours are loved) want to share their home with ones you wish to share their home with. I have one who is very possessive and barely tolerates my husband even though she is loved too. I have another who just loves company, kids, house guests, etc. He would welcome all to his house and shows it by his friendly behavior. So go figure???? :-)