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So I haven't used the Exterminatis book in a while, but looking back, when I did I used the Sanguine Wing and Defenders of Cathedrum detachments to supplement the same CAD. One is a BA detachment (Sanguine Wing) and the other was from the Flesh Tearers (Defender of Cathedrum). Was that legal to use both to support the same BA CAD? Or did I drop the ball and accidentally run an illegal list?

I'm assuming you had a BA CAD, Sanguine Wing and Defenders of Cathedrum (3 detachments). If so, yes it is perfectly legal.

Yup. Always ran a BA CAD out of the main dex. Many thanks for the clarification.