There ARE pathogens that one can carry that can harm the other. Ask a tortoise vet in one of the areas like mine where everybody keeps tortoises. You want to see numbers areas like mine and Phoenix and South Florida with have your numbers.
As far as actual deaths of leopards killed by sulcatas, I would expect those numbers to be low too. Most people see what's going on with the leopard either not eating and hiding all the time like you said, or they see the leopard getting knocked around, and they have the sense to separate them. I don't think too many people are just going to watch their tortoise getting knocked around by another and not separate them. Even with that fact, a fair number still get killed every year. Still, do you really think that person whose backyard tortoise brawl ended in the death of their leopard is going to go on the tortoise forum and tell everyone what an ignorant idiot they were and how their leopard or other sulcata is now dead? That just goes against human nature. They do however, some percentage of the time, seek veterinary care for these injured and or dying animals and those are the ones I see and hear about. I have yet to see a single one of those people who want to tell the world about what just happened.
No one is debating that some of the time people put these animals together and get away with it. Sure they do. I've seen plenty of that with a wide variety of results. I think that due to the sheer volume of tortoise people that I know, like vets and other reptile keepers, neighbors, family, friends, etc., I see and hear more of the situations that end badly than you do. I'm not saying that no matter what this will always end in disaster, I'm saying that SOMETIMES it does end in disaster and its a practice that ought to be discouraged by people who care about the welfare of tortoises.
As far as actual deaths of leopards killed by sulcatas, I would expect those numbers to be low too. Most people see what's going on with the leopard either not eating and hiding all the time like you said, or they see the leopard getting knocked around, and they have the sense to separate them. I don't think too many people are just going to watch their tortoise getting knocked around by another and not separate them. Even with that fact, a fair number still get killed every year. Still, do you really think that person whose backyard tortoise brawl ended in the death of their leopard is going to go on the tortoise forum and tell everyone what an ignorant idiot they were and how their leopard or other sulcata is now dead? That just goes against human nature. They do however, some percentage of the time, seek veterinary care for these injured and or dying animals and those are the ones I see and hear about. I have yet to see a single one of those people who want to tell the world about what just happened.
No one is debating that some of the time people put these animals together and get away with it. Sure they do. I've seen plenty of that with a wide variety of results. I think that due to the sheer volume of tortoise people that I know, like vets and other reptile keepers, neighbors, family, friends, etc., I see and hear more of the situations that end badly than you do. I'm not saying that no matter what this will always end in disaster, I'm saying that SOMETIMES it does end in disaster and its a practice that ought to be discouraged by people who care about the welfare of tortoises.