You say its worked for him so far, but your not saying the possibility that nothing might happen And yes your right with any animal can have an incident, but do we all live in fear of having an incident, or take the facts as ok, where do we draw the line.
I hav dealt with loads of animals, for instance, i could put a guinea pig in with a rat, and no trouble for years, but i could put the same rat in with another rat and will fight to the death.
So where do we draw the line.
Personally, i have heard of more axies fighting with each other. I have never hear of another spiecies tearing into an axie, unless very stupidly a tortoise or something and small fish which will eat gills.
Personally, i do not believe they are solitary creatures.