Jim,I think she meant he couldnt sing in a tradtional unaccompanied style, he clearly could sing in tune,and had a good voice, and was a fairly good musician, and a good songwriter.,and the choirmaster missed his voice.
I prefer Sarahs singing,re interpretation of the big songs, but he was a good singer, not in sarahs league, on unaccompanied songs ,I think she was being over harsh.