Ah yes, Jerry, fair enough observations....
Alex Bradford (& his Bradford Singers) certainly crop up on many compilations - often his '53 hit "Too Close To Heaven" - and the popularity of his Abyssinian Baptist Choir's 1960 "Shakin' the Rafters" album does seem to have kickstarted the modern gospel choir movement (John Hammond writes interestingly in his autobiography about producing that album, where Alex was contractually unable to sing a note).
Btw, Anthony Heilbut's brilliant book "The Gospel Sound" devotes an entire chapter to Professor Alex Bradford.

Apart from that rockin' choir album, some "Best of.." compilations, and original cast albums - "Black Nativity", "Don't Bother Me, I Can't Cope" and "Your Arms Too Short To Box With God - I'm lucky enough to have 7 Bradford albums (mixed LPs & CDs) but there are another seven I'd like to add ...... I figure SOMEONE in the southern hemisphere oughta have his complete output, so as opportunity and finances allow....