So, the cable can only hold 1900lbs or about 8.5 KN, but someone thought it prudent to make sure that two rap rings ended up attached to it rated at over 55 KN apiece or 25,000lbs total? Interesting how a BD #7 stopper is rated far higher than this "anchor" cable and it's no where near 5/16 of an inch. The the cable get connected with Elmer's Wood Glue or what?
I suspect it's the difference between working load and breaking strength. The 1900 lbf number for the cable is a little higher than the working load I found for 5/16" cable (1700 lbf). I couldn't easily find any specs about strength reduction in a lap splice with cable clips, but terminal ends are 80-90% efficient. Lap splices are probably similar. Working load is typically 20-25% of breaking strength, so an ultimate strength is closer to 8500 lbf for the cable (without reduction for connections).
Climbing gear tends to be rated by breaking strength. This would include the BD stopper and the Fixe rings. So, yes there is a mismatch of strength here, but it's not as bad as it looks at first glance. As for one ring vs. two, it does seem a little strange to have redundancy there but not in the cable as well. I'd say the cable is more likely to fail than one of those Fixe rings; although either is extremely unlikely.
What is it with Yarp? Why is it that EVERY comment he makes on MP is something negative in order to highlight how KNOWLEDGABLE and GREAT he is! What are you trying to prove and to who?? Mind your own dang business.