Oh wow. Thanks for posting my translations here haha.
Just some clarification since you seemed interested...
妹思い can be translated as "thinks of his sister", but does not maintain the nuance of "longing" that the English version can also suggest. Instead its more like 'he takes care of her' or 'is a good brother to her'.
A lot of translations become what we call "sterilised" between languages. Making it very difficult to make detailed theories if you're not bilingual. Hence I exist :)
If there's anything else you would like clarified just let me know! (preferably at PokéJungle!)