Don't know what era your KEWB DJ's are from since I don't recognize any of those names (my Channel 91 listening was 1960-62 and again in '66 before KEWB went all-news).
Chris Borden is retired and living in Northern CA.
Casey Kasem - well, everyone knows what he's been doing.
Those are the only two I was able to track down. Borden was an alumnus of KTKT Color Radio 99 in Tucson and one-time PD I think. He lived just a few blocks from me and his claim to fame was his "Hot Times in Old Time Fire Department" club complete with a 1920's era fire truck he kept in front of his house. He also had a radio broadcasting school. He left KTKT around 1960 for KEWB and later my family moved from Tucson to San Francisco where I heard him again. Another KTKT alum, Buck Herring, wound up at KYA about the same time.