Gary Sanchez speaks through an interpreter. Tanka speaks through an interpreter. This is not specific to the Yankees. It is a microcosm of baseball in general. So, when Sanchez goes to the mound to talk strategy with whomever is on the mound and then they have these long protracted strategy talks how the fuck do they communicate. Better yet, when Tanaka is on the mound and Sanchez jogs out there to talk to him I'm like what language are they speaking???
When Larry Rothchild heads out there to talk and you see Tanaka nodding his head I'm just guessing Larry speaks Japanese. I know that sometimes Tanaka's interpreter will go out with him. But not all the time. You see this in baseball all the time. And the fact that Sanchez who appears to be a very good defensive catcher and I think calls a really nice game if he can't speak the language how the hell does the pitcher on the mound know what he's saying.,
It does seem that some players are more willing to learn and assimilate. Not everybody is going to be like Porzingis.
I'm sure the Spanish guys also understand "baseball" language and they probably speak enough English to get by with teammates (no embarrassment.)
Now when Sanchez goes to see Tanaka, it is probably - Fastball, Slider, Splitter, Curve, inside, outside - etc. Simple common words. Some of those words are the same in Japanese, Spanish and English.
You never know what they are taking about. It could be about wedding gifts.