Defensively, Porzingis is nowhere near the impact guy Robinson or even Isaiah Hartenstein. That said, he’s committed, has the length, and will be surrounded by defenders strong enough to avoid being a hindrance.
That’s not to say he’ll replace Robinson as the five in the lineup. What it will do is allow Tom Thibodeau to switch to a more attack-focused, spaced-out look with him in the center for about 20 minutes a game, then slide down one position and take Obi Toppin‘s backup for four minutes to take it to 30.