.."or at least ONE of them" is the point I am making.
One can have ABS feed from an OVP and still have poor feed to CIS control.

We have all seen that exact state hundreds of times ...and I agree that OVP output feed monitoring is the correct way for perfect diagnosis, which is why Techs and Shops that are hip to that fact all have a spare/known good OVP in their toolbox...one of the few times that replacement with a known good one is a true diagnostic time saver..
OVP gremlins come in many shapes and sizes and are falsely diagnosed as many times as they are blamed for things they have nothing to do with...but understandable, due too there high fail rate, specially the original, single fused versions.

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A Dalton