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Garry Kasparov: FIDE rating 2812, possibly the best chess player who has ever lived.
Yuri Dokhoian: FIDE rating: 2580. Weak, completely unknown GM.
Dokhoian has been Kasparov's coach since 1995. Not too many people know that because he is content to make his living and spend his life helping Kasparov win. He is also much younger than Kasparov.
Here is a picture of them. It says a lot.
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I don't think this qualifies really for a lot of itangible reasons. The type of coaching he gives is different than technical coaching, it's not like Kasparov is asking for technical advice on how to play XX during YY. It's more likely he talks with someone nearly as good as he who can help him evaluate faster, and to have someone who can look over all his play and tell him where he thinks he is failing. I think your example is basically like BK hiring Schneids as his coach. The type of coaching that Yuri provides isn't something TA could do in the format he has, and really that type of coaching is the only type that would be meaningful.