Are you assuming the refusal to give a NTC is all on Brez?
If I had to guess, it's not on him.
I have no idea if the money aspect of the trade was the very highest Brez was allowed to go or Brez wanted to go, assuming he was allowed to go higher. That's the part "all accounts" is not sure about.
Without all those facts, assigning blame is subjective and opinionated. Even with all the facts, there is still a subjective component of assigning blame porportionally.
To me...
If Breg never would sign w/o a NTC, and Brez could never give one, it's not on Brez.
If Breg would never sign w so much deferred money, and Brez needed to defer that money to stay under a max AAV number, it's not on Brez.
If the number Brez offered was the most he was allowed to offer, it's not on Brez.
If Brez got Breggie upset with his antics, and that was the reason, Breggie said no, and it wasn't about $, NTC or deferments, then it's on Brez.
There is room for shared blame, too.
There is room to say Brez botched it, but was never going to sign Brez unde rthe limits placed on him, too.