Inexcusable---if it leads to less time for Smart.
I'm baffled as to how starting Jameer Nelson will somehow boost his trade value? Quite frankly, I find the argument illogical. Nelson isn't some fresh faced rookie, he's a ten year veteran. NBA talent evaluators have settled opinions as to what Nelson can, and cannot do, and a two month mini-sample isn't going to radically swing opinions.
This season is about one thing: planning for the future. Nelson won't play a meaningful part in our future, Smart will ( or he'll be used as a major piece in acquiring future talent). Smart needs 30+ minutes a night. He needs minutes to develop.