I also heard him say on Hot Stove that he does NOT enjoy DH'ing. He said he likes playing in the field as much as he likes hitting and he doesn't feel like he's playing if he's not always moving his legs and running around. So if he doesn't want to DH, that should be a good motivating factor for him to be the best defensive 1B that he's capable of.
Also, he was a fantastic interview, you could tell how much effort he's put in to communicating in a second language. Hopefully the effort he's made in that area is indicative of the effort he's been putting into continuing his on field improvements.