According to Jon Hendricks, there was no Claude Cloud - it was a pseudonym for arranger LeRoy Kirkland.
I vaguely remember that on the original recording, Cloud was listed as a "banjo" player. On later discographies, he's listed as a drummer. But I'm reasonably sure he was really Kirkland.
This one dude at a second-hand record store once told me (20-25 years ago) that Cloudburst was originally a Gene Krupa tune featuring Charlie Ventura on tenor.