I have a guy with 0 power named
Orval Yeats. In his first major league season (platooning against righties) he had 488 at-bats and hit .309. The next year he also platooned, but his BA plummetted to .257. This season he hit .250 over only 16 at-bats before I sent him to AAA to replace him with a slick-fielding SS, so the sample size may still not be big enough to tell which of those seasons represents the real Yeats. But since my guy has 100 speed and great baserunning, he was able to leg out grounders which really helped him. Your guy also has good speed so he may see a similar effect.