Indeed, he is absolutely fittter than before and I don't think wishing Porzingris remain to his slim body is still a good idea because the others are now also evolving. He will fall behind, his body most probably getting crushed by bumping into other's brick wall-body if he didn't change at all .
The pressure is on them because I see them right now as the hope and future of Mavs. These two young men should perform great this upcoming season to prove their worth.