Am here visiting my wife in Seattle so I don't have my Sox media guide with me. I did look this up a few years ago and if I remember correctly, Kenny averaged 83 wins a season under his tenure.
He had a better winning percentage than Roland and Himes and a worse one (I think) than Scheueler.
As far as number of winning seasons, Kenny had eight (although he also had a lot more resources to work with), Himes had one (he was only here for four years), Roland had six if I remember. Scheuler had six.The best winning seasons however came under guys like Frank Lane and Ed Short.