I would guess it means he cannot be sent to the minors or bought out. That is the NMC part of the deal. The NTC part doesn't bother me when you look at it as I laid out above.
As for Brass/Step, I loved the Brass deal so I won't say a negative word about it. He took less money to stay here, and honestly we got that deal done the summer before he really took off. If we tried to sign him now off of this past season he would get closer to 6 mill for sure. So good smart timing on Brass. Step was always getting more IMO. He has had better seasons than Brass until this past season for Brass, which happened AFTER his extension was signed. With everything factored in not sure Brass and Step is an apples to apples comparison.