I set up a 10 seat $1/2 game in Turbo Texas with the 'Bret Maverick' advisor profile at each seat, froze the button and ran it for 1,000,000 hands. Each player's strategy and skill is exactly the same, each player should get about the same cards over that number of hands, the only the thing that should vary is value of position. The results (sorry but the message entry form doesn't format columns at all):

Position SB/Hand
-------- -------
SB -.71
BB -1.54
UTG .107
4 .154
5 .140
6 .155
7 .198
8 .229
9 .207
Button .36

I think the win rates/position should be considered in relation to each other rather than as absolutes. I.e., the button will win about (.36 - .106) = .254 sb/hand more than UTG. Also, the fact that some later positions won less than the preceding one suggests the long run is much longer than supposed for luck to even out.