awww BOTH kitties are just beautiful. I like the name Linus. Felix looks like a playful and fun kitty so I hope he gets back to being a happy kitty!!!
We never had any guideline to introducing cats over the years so just went with *gut* feelings and never a problem. Normally we kept the newcomer in a carrier and let the others sniff while we ignored the newcomer and lavished attention on the residents. If there was no or minimal hissing, etc we opened the door and let them out a bit at a time. There are always hiding spots. We only gave attention to newcomer when residents were busy. Guess we were lucky because no blood was ever shed. One pair took about a year to become friends. Our newest, Dylan, took over the house the 2nd day here, while the resident twins followed him around like little niece and nephew!! We were on hand like hawks with squirt bottle in the beginning and would have isolated them if fights broke out but they never did!! I always just played it by feeling. But, guidelines are good to follow, too. I just did not have them - but still figure break the rules if things are going well.