So update on the Foundling:
He has the makings of being an awesome cat. Went to the vet and leukemia was negative. The vet gave OK for him to socialize with the rest of the posse.
He's very busy and playful, and VERY social. He can't understand why Jackson the blind Jedi gets upset when he gets too close. "He's lookin' right at me, he must want to play" followed by hissing. Jackie did tolerate his tail being used as a toy for a minute or so, which is impressive.
Kirby the six million dollar cat was once a foundling as well; he loves kittens and keeps trying to build his own minion army: