I understand that this post by my worthy constituent and fellow board member Fernando Ortiz de Urbina perfectly fits the purpose of this thread.
He ellaborates and comes to a well-reasoned conclusion on who plays trumpet in the famous performance of 'Ko-Ko' from Charlie Parker's very first session as a leader (Nov. 26, 1945):
http://jazzontherecord.blogspot.com/2013/11/november-26-1945-at-savoy-records.html
(initially posted on November 2013 and revised and updated just a few days ago)