Not sure on the equipment details, but these guys are 100% Missouri legal and are very good snaremen.
I'm sure they are. Many other fur trappers are not. CR regulations vary state by state that allow them, but you originally said according to the BMP's and I think they are very specific and restrictive. I haven't seen them in years, so that may have changed??? Still with the objective of keeping the catch alive, they are very poor, by design, and in application when set legally, for fur trappers who are going to be the main users of the CR's.
I cannot counter anything you've stated as my snaring is limited to beaver. I use slim locks and microlocks on 42" of 1x19 5/64" cable connected to a 7x7 3/32" extention by a #6 barrel swivel & a 1/8" quick link. I make my snares.
I’ve never used CRs (never used any relaxing locks and I don't pay any attention to the likelihood of entanglement.) I don't use break-aways, but do put a loop stop on every snare.
I have never land snared, other than for beaver on a crossover. My non-targets have been a few otter and coon over the years.
I have not read up on latest BMPs either.......other than what Florida FWC has on their website related to this change..
My statement about using the BMPs to get snaring legal in Georgia is sparked from the fact that wildlife agencies give much more credibility to written BMP guidelines than any trapping association or "expert." That's just the way it is. The Southeastern Association of Fish & Wildlife Agencies promote the BMP compilation as they liken it to published scientific research...whether we do or not.
An example of this: Florida just got most of their traps back because the FWC referred to and relied on the BMPs. It doesn't appear FWC took much advice from any expert or the Florida Trapper's Assn.