My issue with bringing him in on a "cheap, one year deal" is that even if we do .... so what? What is the best case scenario here? He plays well (while we still don't contend) and then hits free agency the next year where we either lose him or overpay for him? All the while, the development of our real core has been slowed down?
I say if he's a guy that Danny really believes still has the potential to be a real player in the league, then we sign him to a 3 year, $9-12 mil contract to give Turner a real shot at proving that and giving our team some time to actually benefit from it. (I don't think he is that player)
If Danny doesn't believe he is the real deal, then pass. I don't even want him at a short deal if the best case scenario is he just leaves in FA the next season or the young celtics core see yet another one of their teammates traded away for a heavily protected draft pick 3 years in the future.