User blog comment:Jonghyun408/Survivor: Finland Post-game interview 8/@comment-26485526-20160122003130/@comment-25202711-20160122055529

David: (laughs for a bit) I have no regrets, like I know I would always be the bottom if I join them, plus I didn't know Simon and Tracy will turn on me, if I knew,  then probably I should have turned on them,  oh well,  that's the Game.

For tbe second question, I Will say it is because he allied some goof people. Technically, he never did anything to save himself on his own,  people such as Tracy and Jacalyn who are good strategic players saved him,  so him making some kind of relations with good social players is the reason he is indestructable.