Just to weigh in on the issue, I was astounded when I heard Kenny G. noodle along with "What a Wonderful World", but I figured Louie's estate had blessed the project, so I was OK w/that even though Kenny G. sucks.
Time will sort all of this out, and future compilation disks won't feature the overdubbed Kenny G. w/Louis Armstrong in favor of the original verson, IMHO.
And for those people who have trashed Pat Methany in this thread, please consider that he was an early friend and musical collaborater of one the the greatest jazz geniuses who ever self-destructed: Jaco Pastorious.
http://www.jacopastorius.com/shoutouts.html Jaco is probably the only person who has ever lived, with the possible exception of Pat Methany, who could overdub an instrumental solo onto "Wonderful World" and have it sound right.
Pat Methany has credibility to me, and his opinions deserve serious consideration, IMHO.