FWIW, there is site which tracks winnings (and losses) by players at HCL:
http://www.trackingpoker.com
Garrett is the winningest player in their game, at least in terms of total winnings. There are others who have won more per session, on average, but most of those have played far less often than Adelstein.
It’s also instructive to note that 19 of Garrett’s 53 sessions were losing sessions, just under 36%. This would seem to be a good thing to point out to people just getting into poker—that on any given day, even the strongest cash players may lose somewhere between 1/3rd-2/5ths of the time. What seems to matter as much as anything is how big/small the winnings are relation to the losses. An HCL player can lose $11K nine times, but becomes a “winning” player if they have a +$100K session on the tenth try...