The 450 sale on Brady was the auto limited 100 run, the one you cite is the regular auto. Hence the difference. Wonder what a Brady 12/100 auto in 9 or better would sell for. A million?
Also, population 14 PSA 10 for an elite modern card is extremely low. The best comp is probably Jeter, pop 12 PSA 10 on his SP foil, and that’s gone from 50k in 2017 to 180k last year, leading up to his HoF induction coming this year. Brady’s a bigger name for sure. Seven or so from now when he enters the HoF? Who knows.
Regardless, for me, anything that moves grays closer to golds is a good thing, especially on the higher end grays. They are seeped in so much more history. There is definitely more going on behind the scenes with them now, as well, especially after this trade (which was a legitimate one for one swap, yes). I’d say that 7.0 up is probably one of the top 10 or so nicest known copies. It will be interesting to see how that one ends. What will also be interesting is where the dozens of 5.5s will settle. How big will the gap be between high grade (I’d say 7.0 or above) and lower grade copies.
As for the highest, there is a 9.0. Given the harshness of the WATA scale on these, that’s mint as hell.