Meh, Bernstein basically read the entire article on the Score yesterday. I don't think the plexiglas principle is a terrible argument, when you look at it historically its been very accurate. It doesn't mean the Cubs are guaranteed to take a step back just that we can't necessarily count on being as healthy as we were last year (particularly with our starters), can't count on leading baseball in walk off wins, can't count on our young players not having sophomore slumps (which tbh is a dumber principle than plexiglas), can't count on the back end of the bullpen being as good and (relatively) consistent, etc. A lot can go wrong in a season, and the fact that Sheehan, who is a strong believer of the plexiglass principle, is still picking the Cubs to win the division and 90 games tells you a lot about how good and deep the Cubs are. It's a terrible argument. Anthony Rizzo is the only position player from the entirety of 2014 still on the team (sans late season callups for Baez and Soler). Our lineup we trotted out most days was Bonifacio/Lake/Rizzo/Castro/Olt/Schierholtz Castillo/Barney. With deadline fire sales. If you can convince me why that team should have any bearing on projecting the 2016 Cubs, then I salute you. Edit: David beat me. Yes, but the principle is not just players overperforming, it has a lot to do with luck evening out. The cubs played the 3rd most 1 run games last year and won 62% of them, they led the MLB in walk off wins, they went 13-5 in extra innings, their pythag was 90-72, their ace went 3.5 months giving up 4 ER total, they were slightly luckier than the average MLB team with regards to injuries, above average with regards to 'cluster luck' I don't claim to be a baseball savant at all and im sure my devil's advocate argument (yeah I actually don't believe the Cubs will suffer from much of a 'plexiglass principle') will be torn apart, but the argument (which is essentially 'i dont think the plexiglass principle is terrible) makes sense to me.