Introoder cat's real identity

On Thursday we told you about how Siena rescued Chilli from the introoder cat and the tree. Well, the story continues! The following days to the eventful night were calm without any introoder cat sighting. Then, one day, the neighbourhood was plastered with these:

It says this:

On the 2nd of August my grey tabby Dado disappeared. He's one and a half years old and chipped. Please help me with the search, he most probably got locked into a cellar in the neighbourhood.

Mom felt guilty. She thought that Siena had frightend Dado so much that he got lost. She kept an open eye for him, but he didn't show up. A few days later mom was talking to the neighbour right behind our wall. He's a nice man who allows mom to climb over the wall into the other world to go and look for us whenever she wants. Anyway, as they were talking he suddendly asked her about the third cat. She went "Which third cat?" and he pointed towards some rose bushes. Sure enough there were the three of us engaged in a proper stare-down. Mom rushed off to call the number in the ad. The young woman on the other end told her that Dado had since returned home, is a happy neutered male and just seems to "wander quite far away". She asked mom to look after him a bit and pet him from time to time. Mom went back to have a chat with Dado. But it seems he's not too friendly outside. He puffs his tail and hollers terribly, it's pretty obvious that he doesn't want to be pet! He gets into the other world which is adjacent to our patio over a high wall. Mom is afraid that one day we will follow him and she knows that there's a patio behind that wall with an open garage entrance!
We since had a few encounters with Dado. He's very cheeky and persistent and challenges Siena for her, I mean our, territory. And he pees on our terrace!

On the look-out for Dado in our patio.

Chilli even practised her tree-climbing so she'll never end up stuck again.
Siena doesn't really need training but she did it anyway.
Notice the special back-up tail!

Uh oh, why is Siena in stealth mode? Do you see the introoder somewhere?Chilli prefers to stay up on the wall.
Yep, there's a tabby lurking in our territory!Siena and the introoder in a match of stare-down.

Extensive (!) coverage of this meeting tomorrow. Be prepared for some explicit cat language.
Purrs, Siena & Chilli