Not if you trade for Archer. Archer has a career 3.51 ERA with 3.48 FIP and with the league switch and the Cubs defense an ERa in the mid 2's is not hard to imagine. He also has a career 9.34 K/9 better than Jake's 9.22, and has been over 10 for 2 years. Both men have similar career BB/9 and HR/9 and are frankly similar concerns in those areas. Say you were able to swing the deal for Archer and get Michael Kopech for Arrieta. This year you would have a rotation of Lester, Hendricks, Archer, Lackey and Montgomery while next year Kopech will likely be up as a 4 or 5 while he learns the ropes and Montgomery either sticks or the team would certainly have money for a guy like Yu Darvish. Now that will be staff with at least 3 pitchers under 30 under team control for multiple years. Possibly 4 if Montgomery works out. No, I don't think it makes us worse, it makes us no less than equal as a pitching staff with the possibility to be better and sets up the future nicely.