Scion is more of an example for the opposite point; the fund manager didn't consistently beat the market, he made one big bet that turned out to be correct; furthermore, even if this was skill, rather than luck, it still doesn't mean that this skill would apply to any other market situation.
That's not quite true. Scion was up in 2001 and 2002 (when the market was down) and they beat the market in 2003 and 2004 - in each of those years, they were primarily a long-only equity fund.
I'm not sure what the performance was in 2005. In 2006 they were down 16% (because of premiums on their CDS positions) which they then recouped in 2007 and early 2008.
