I know "Johnny's Greatest Hits" (one of the first greatest hits compilation LPs) and his first Christmas album were big sellers for them, but that was over 60 years ago. While Columbia has certainly stood by him ever since he returned to the label in the late 60s, most of his albums didn't even crack the top 100, nor has he had any legit hit singles (with the exception of that disco-y duet with Denice Williams in '78) since then.
So hard to see how he'd be on any "untouchable" list, but then again --it is also odd that DV hasn't touched him. He does seem a perfect artist for them to reissue. So
BTW, how many quads did he have?
Unfortunately, they'd all have obviously been from the early/mid 70s, when he was mired in the typical easy-listening-singer trap common at the time of covering other artists recent big hits.