i think he will score more runs and steal more bases than any NL player. That is enough of a reason. If you look at his complementary statistics, which are hr, rbi, and average, none of them will harm you.
I donk know about you, but if you told me any player that would lead the league in two statistics, i would put high value on them, weather it is steals and runs, or wins and whip.
He may be undervalued because so many people look for players that slug homers and, the run and sb statistic is so undervalued.