There’s a difference between greatest and those who changed the music and you could argue about that endlessly. Armstrong changed the music but did Bix? Marc Myers probably sees him as coming out of Armstrong and Keith Jarrett as coming out of Bill Evans and so forth. Ultimately, it’s just one of those list that people debate but just one person’s opinion.
As far as the last 50 years goes, is there anyone who has altered the music in the way that Bird, etc. have? I’m merely posing the question, not making a judgment.