I can't properly explain skarner at his peak.
If you can't picture the sheer terror of shurelyia rush skarner with a flash cancelling ult at 16minutes (who could also charge his passive on towers) and buffed lee-sin, then you will never know what carry jungling is.
Man, you don't have to, but what you apparently do need to do is explain to me what you think a "carry" is. I'll go first:
Carry: a fragile champion that builds mostly/entirely offensive items; team strategy revolves around protecting them and keeping them alive to do damage for as long as possible in fights.
Skarner/Lee Sin: champions who dive into the middle of the enemy team to Impale/kick out a carry, often dying in the process or being reduced to low enough health that they have to retreat from the fight, which is fine because they really don't do much once they've accomplished their mission.
Skarner and Lee Sin aren't "carries" and never were (with the exception of the few people who ran top/mid Lee Sin). They're
anti-carries, if anything.
Like, I'm sorry, but I know exactly what carry jungling is. It's
playing an actual hard carry champion in the jungle. What you're describing is just being a good jungler in general, which is laudable but a completely different thing. True carry junglers were unicorns in Season 2 because it was routine for junglers to end the game with 2k-4k less gold than laners, and what gold they did get was often earmarked for "team burden" (wards, Oracle's, Aegis, etc.) because the supports were even more poor. You had to get like six or more kills in laning phase to even reasonably attempt it, which is why most professional junglers
didn't.