It's not "stat manipulating," sorry. Looking at the previous three years is standard practice for trying to project how a player will do in the future. Lester's career is not complicated. He had two great years in 2009-2010, a career year in 2014, and otherwise he has been a good pitcher well short of an ace. The numbers I gave for the three year average were a 3.65 ERA, 3.49 FIP, 3.60 xFIP. Lester actually had a worse FIP and xFIP for three of the last four seasons (with 2014 being the dramatic exception). 2011: 3.83 FIP, 3.62 xFIP 2012: 4.11 FIP, 3.82 xFIP 2013: 3.59 FIP, 3.90 xFIP His 2014 season skews the stats far more than his 2012 season. Just because ESPN says a guy is an ace doesn't make it true. For a guy who is already in his 30s, and given the track record of $100M+ contracts, I think it is a horrible blunder by the Cubs, and I expect time will prove me correct.