Smart.
The problem with not playing Nelson at all would be the chance that he picks up his option and we are getting nothing out of him. At least he would be a PG who can shoot, unlike Rondo/Smart/Pressey. That would be an interesting change of pace and might work better in Stevens' system. It seems like Stevens' system does not need the top PG in the league. It needs 5 guys who can shoot and a bunch who can shoot from distance.
I don't see Pressey being around next season with all the picks we will have, his non-guaranteed contract, and his marginal status. If he likely won't be around, I don't know that there is any point in giving him priority over Nelson. Thornton will be an RFA at season's end, as will Turner.
Unless we are able to package picks, next season looks like we could be like Philly this year as vets leave as free agents and are replaced with rookies.