Kennedy had a subpar year in 2015 giving up 31 HRS in 30 starts. However here are his stats the 3 previous years. I am doing a comparison with Shields, since James pitched here and both of these guys have been inning eating starting pitchers
Kennedy had 54 starts with Az and 43 with SD in 2012-14. Shields (13-14 KC, 15 SD)
ERA -- Shields 3.40, Kennedy 4.16
Slug% Allowed - Shields .406, Kennedy .427
OBP Allowed - Shields .312, Kennedy .317
Kennedy had about 8.5 Ks per 9.0 Inn. Shields was just slightly lower
So Shields had a lower ERA, but the Slug and OBP comparible, especially when you factor in Shields played 2 years at the K with the Royals defense. Obviously Kennedy will benefit from playing with Us and at the K, but let's hope he does a better job keeping the ball in the park and keeping his Slug% allowed down somewhere around .400