You haven't "proven" anything until to showcase that every single orca dies sooner in captivity. That's first.
Second, you'll understand the conversational aspect of this. If you'd like me to write-up the legal version, with qualifiers and an index of arguments, you'll need to cover my fee for doing so.
The original point, quite clear actually, is that HUMANS are living longer due to captivity. That's second.
My counter to your "orcas" argument was not that orcas die sooner in captivity. It was that orca captivity is incorrectly handled. As a result, the fitness and social aspects of orca captivity are incomplete. That's the problem. That's why your exception proves the rule: it's captivity done incorrectly. Your housecat won't live long if your house doesn't meet its needs. That's third.
You're incorrect about elephants; that's an even better example. Elephants in proper captivity -- of which there are very few, and they are not within typical zoos -- live full lives. But there are so many problems with elephant captivity -- namely that humans are incapable of caring for elephants. Think about it. The elephant lives longer than any single human can care for it, and there are just so many things that a human cannot do to care for an elephant without danger. So this is more of an example of humans not being capable of providing suitable captivity. With orcas, the case is more of an experience thing too; we're still very new at it, and don't have sufficient access, since we don't have gills. But with elephants, you'll find that in the non-zoo, protected lands, where we allow elephants to roam "wildly" but protect them from everything imaginable, the elephants live longer. That's fourth.
If you intend your arguments to have merit, and therefore value, you'll put your name to them -- at least so that I know with how many participants I'm conversing. If, on the other hand, you intend to shout into the void, and have no respect for your own arguments, then they simply have no value: because you aren't standing behind them. The ability to be incorrect is inherent in valuable arguments. It's called falsifiability. The capability of being held accountable for an incorrect argument is called respect. You're only as good as your name. Right now, you have no worth.