To people thinking that it's weird that Brady didn't notice a difference. Both Rich Eisen and THEMMQB has tested if you can notice a difference between 13.5/12.5(TheMMQB) PSI and 10.5 PSI. Both said that they couldn't notice a difference.
Rich Eisen @richeisen 1m1 minute ago
As Brady is saying, you can not tell the difference between a 13.5 PSI ball and a 10.5 PSI ball. We did that on my show. I couldn't tell.
The MMQB @theMMQB 12m
Again, from our informal test, diff between 12.5 and 10.5 psi is practically imperceptible. 10.5 definitely not soft.