This is news to me. It would mean the JQ would be taking a step down a rung though (IMO). He is amongst the best soloists on the planet but becoming CO-principal (emphasis on 'co') in any orchestra from his present pos. would be a step backwards. If the position is a shared principal then that would be different. Either way Ibragimov and JQ in the same team sounds like a bit of a mismatch. Ib has a wild flare and a big growlly russian sound where as JQ is about as refined as you can get. Where do these too styles meet?
FC