I'll be honest, I don't think last year's team pulls off that comeback.
I know they had a lot of comebacks, but they probably could not have come back from this game with the lack of interior strength/rebounding (via Baynes and co.), and with how awful they started (esp. if Isaiah was contained).
Now they have rebounding, bruisers, more scoring options, and a DEEP bench. Kudos to Ainge, he built a great team!