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If it is still the same situation as in The Greatest by Jim Denison, then it is some guy whose name I forget--one of the original Ehtiopian greats who is pretty much the national coaching guru. I think Wolde is the last name. Geb is also managed by Jos Hermens, who was a world class long distance man in his day, but I'm not sure if he does any actual coaching.
Wolde...I think you mean, Wolde-Meskel Kostre. Not sure about who coaches Geb tough.
Last time I saw Geb Dr. Yilma Berta was with him.