We could always just try to sign him in 2021. I understand this would mean letting Hayward walk and likely salary dumping Kemba, but that is the cost of doing business. Moving forward with Giannis, Tatum, and Brown as our core would be insane and we would still have Smart, Langford, TL, and any rookies we select this year. If Giannis really does decide to leave MIL, we will have a pretty incredible situation for him here in Boston. We would be contenders for the next 10 years. DAL is really the only other team that is comparable, and that is assuming you are optimistic of Porzingis' future health.