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Ken never left. He stopped being the sole art guy after gen 2 when he started relaxing a little and letting larger teams design stuff, he just makes the final official art in his style.
Turner became the director of the art department this gen just because he is British. Did it work? You tell me. The thing they seemed most excited about his involvement is that you must push the pkcenter doors and some streets have public installations like water fonts designed for Pokémon use.