Let GU rest in peace. But I always felt uncomfotable with his off-the-mark dismissal of BW's songs and capabilities while praising only his collaborations with him (Heavenly bodies!?). Regarding Boettcher's music, as low as his profile could be, the world's lived with his songs for 45+ years and we're still to find something more than a very talented musician. Heck, Jan Berry was a genius too.
Before it all went rapidly downhill for him I'd say that about '65 Jan Berry was pretty much neck and neck with Brian in terms of producing and arranging.