I wonder why you would have doubts about someone you clearly don't know anything about? Before becoming a partner and then CEO of YC, Sam Altman was a founder o

I wonder why you would have doubts about someone you clearly don't know anything about? Before becoming a partner and then CEO of YC, Sam Altman was a founder of Loopt (failed startup). I was surprised at his sudden rise at YC but it seemed to work out. No reason why this shouldn't be the case here.