Do you have a source on the stealing part? A quick Google search didn't result in anything
Fail0verflow demoed how they were able to derive the private signing keys for the Sony Playstation 3 console at I believe CCC
Geohot after watching the livestream raced into action to demo a "hello world!" jailbreak application and absolutely stole their thunder without giving any credit
In any case he absolutely did credit them, it's easily verifiable: https://web.archive.org/web/20110104040706/http://geohot.com...
Sony sued them both, afterall!