I know just what you mean with Big T - Big D's the same - 'Three cats are enough for anyone ' - I keep telling him I'm NOT anyone - he just doesn't listen!
LOL. You'll talk him around one day and when you do, I call for photos (A small truck worth)

Me & PaysForIt have the opposite problem, we encourage each other too much (in regards to specific cats not just to HAVE another)

In fact the only sticking point was Treacle. i.e. Three is our limit. Once you get past three cats, introductions get very easy and what does one more matter.

By THIS point you are known as the mad cat people and people start asking you about helping them with their cat problems. This is how we found out about Bramble's Mum & siblings.