[Throttlesteer]

Sorry if I misinterpreted your post. The AHs are relevant because all of the examples you identified came from either PWCC or Heritage. They are both known for selling "undergraded" or superior examples for their respective grade (hence why they fetch bigger $$$$). I think the jury is still out on SGC as a whole. But, the common thought is both SGC and PSA are becoming tougher regardless of grading tier. In another thread, I mentioned that many cards with the recent SGC and latest-generation PSA holders seem to be .5-1.0 grades lower than older generation holders. Many new VG cards would easily have fetched a 4 a few years back. Check out the T206 Johnson Portrait PSA 3 on Ebay right now. Tell me if you think that has a shot-in-hell chance of getting that grade today.

Both PSA and SGC can cherry pick a specific auction result to try and boost their individual market reputations. But, I haven't seen any evidence that SGC is consistently outselling PSA. It's undoubtedly what they're trying to portray (per your second point).

I will also note that there are a large number of re-holders (identified by their cert #) showing up, banking on your observation.