Really wishing we had him now!
Absolutely. Right now, he is better than Edwards, Langford, Green, Nesmith, G. Williams, Waters, Fall, and maybe even Teague and Pritchard (he is a much better passer than Pritchard though obviously hasn't shot well). And he is way more top end potential than Ojeleye and Pritchard (so even if he isn't better now, he will be in the future unless he mentally implodes). He'd also be the youngest player on the roster as he is about 6 months younger than Nesmith. A bad shooting game doesn't change any of that analysis at all, especially when he had 7 assists showing off decent passing skills yet again.
And to be clear, I don't think Porter would change Boston's tier at all this year, and maybe not ever, but he certainly has far more potential than most of the roster and when you can get those players for literally nothing, you should take the risk. Ainge, however, is risk averse. I would never expect him to take that sort of flyer on a player, because he never takes those sorts of risk. We've seen it with established stars (like Cousins) and rookies. Ainge doesn't take risks. he only makes a move he knows he will win, at least recently. He hasn't taken a real chance in years.