Ah, I missed anything about LE questioning SC about MF. Who is MQ, sorry? Been away for a few days.
I do think it went down that way.. My personal theory is that LE got surveillance video of the car or a car used in the kidnapping. (And Shane's best friend said that LE was able to get video). Or some information that I think that led LE to zero in on the house/location, possibly where the vehicle or an occupant was registered. I think CPS was called in or on the scene because there was a newborn infant involved in a potential kidnapping case. I think CPS called the fire department to request the infant be evaluated, medically checked out, and transported to the hospital for a complete examination.
I think the volunteer fire department said they were called to the scene after being contacted by CPS to do an evaluation. The head of the fire department said they were contacted by CPS. I think that blew up in the media that it was CPS who contacted LE (leading people to believe that the tip/lead came in to CPS who contacted law enforcement). When in reality I think that LE was already on it and CPS contacted the local EMS to check out the baby. jmo. (Which would mean CPS prompted the Cy-Fair VFD response... NOT LE or the Texas Rangers response.)
Also, I don't think CPS would be the one calling for a welfare check. They ARE the welfare check. I think they called for a medical evaluation, but a few words thrown around, and it's gotten a bit convoluted in the media and evolved into many rumors of who supposedly called CPS. (Not saying someone didn't - just that nothing like that has actually come out and I think it's only being inferred from a few statements that were unclear.)