Maybe you need a metaphor for him, based in finance "At the moment, we're a credit union who only does banking in Japan. We'll expand to loans in English one

Maybe you need a metaphor for him, based in finance "At the moment, we're a credit union who only does banking in Japan. We'll expand to loans in English one day. You send us an English speaking loan dilligence expert. He's VERY talented, but at the moment we can't use his skills AND he'd have to learn a whole new language to be able to interact with the rest of our business, none of which he's familiar with."