Incidentally, POLAR first started by bootstrapping off of Southern's Certificate. Now there's a link!
Duh ! And Atlas got theirs off Tower, thanks to me and a few others (A/C 505). I was also with Dick Dunn at SAT getting the Cert done.
You seem to be finding out things others have known for years.
And you might just be Moving on up to the East Side, Mr. Jefferson....