On the average you're certainly correct....however, this wasn't the case with Roy.
Roy faced weaker competition the majority of his game 7's. Of his 13 career series that went the distance, only 5 opponents were of higher seeding.
Again, it's only a minute statistic....but it's quite ironic that the widely considered most 'clutch goalie of all time' actually has a losing record in winner takes all games (against a majority of lesser seeds nonetheless) and with (even more telling) a painfully average sv%.
His "painfully average" save percentage might have to do with the small sample size, considering the worst day of his 1,276 game career happened to fall on one of the 13 games of which we are evaluating. After all, going into Game 7 against Detroit (his third Game 7 of that postseason), his SPCT was .923 and his record was 6-5 with a 2-0 record in OT, 2 shutouts, and only one loss to a lower-ranked team.
1986 Hartford (-3 points): 2-1 OT W, 24/25 Saves
1991 Boston (+11 points): 2-1 L, 27/29 Saves
1992 Hartford (-28 points): 3-2 OT W, 39/41 Saves
1994 Boston (+1 point): 5-3 L, 26/31 Saves
1998 Edmonton (-15 points): 4-0 L, 13/17 Saves
1999 Dallas (+16 points): 4-1 L, 21/25 Saves
2000 Dallas (+6 points): 3-2 L, 26/29 Saves
2001 Los Angeles (-26 points): 5-1 W, 25/26 Saves
2001 New Jersey (-7 points): 3-1 W, 25/26 Saves
2002 Los Angeles (-4 points): 4-0 W, 23/23 Saves
2002 San Jose (Equal points): 1-0 W, 27/27 Saves
2002 Detroit (+17 points): 7-0 L, 10/16 Saves
2003 Minnesota (-10 points): 3-2 OT L, 27/30 Saves
I'm not saying we shouldn't acknowledge that he lost two Game 7s that he shouldn't have, but I am saying that it is too small of a sample to look at SPCT when his career mark had a near-20-point swing at the age of 36. After all, if we were to play the extrapolating game, we could also say that his record of play in Game 7s also has him on a seasonal pace for 10-12 shutouts, or that Hasek's has him on pace for 22 shutouts in a 22-44 season.