I don't think so.  Shane makes mistakes too.  He misses, he chooses to go for shots rather than play safe, he breaks dry.  I doubt highly that Shane wanted the score to be 92/91 going into the last ten games.
At Large has all the stats but I would tend to think it is more along the lines of streaks that can come up in long matches.  I think Shane is the better player slightly and that is what ultimately plays out over distance.  But as any of us know, even when we are a ball or two below another player we are likely to have a couple good sets where we out play that "better" player.  
And I don't think that Jayson is a ball under Shane.  Maybe half a ball.  As well I think Shane is also prone to losing focus a little and having min streaks where his head is not in the right space.  That's just a feeling who knows what's really going on in there?