Texas Rangers' Yu Darvish

Have noticed that Yu's mechanics have improved in comparison to what they they were in Japan, and what they were in the early stages of change in his first spring training outing with the Rangers. He must be fairly intelligent as that and the number of reps are important in bio-mechanic changes and muscle memory development. If he could improve his glove side actions during delivery and follow through, he'll reduce rotary inertia and increase his hip rotation. This improvement will increase his inning workload for each season and prolong his career. The Yankees' David Robertson would be a good  mechanically sound "fellow righty" for him to model.