This is a ridiculous thread on so many levels.
First, the Celtics haven't won a title in 15 years and have been to the finals only once in the last decade+. There is no comparison to the Celtics team that was marching to its 4th finals appearance and 3rd title with the core (they'd end up with 5 finals appearances and 3 titles).
Second, Bird was the best player in the world and had been off and on for the basically 7 years at that point (and had been a top 2 or 3 player that entire time). Tatum is arguably not even a top 3 player in the sport right now and this is clearly his best season (being the front runner for MVP is not the same thing as best player - Giannis is clearly the best player in the sport and guys like Jokic, Doncic, Curry, Durant, Embiid are right there with or better than Tatum).
Third, the 86 Celtics are one of the 10 greatest teams in the sports history (65 Celtics, 67 Sixers, 71 Bucks, 72 Lakers, 83 Sixers, 87 Lakers, 96 Bulls, 01 Lakers, 17 Warriors). It has yet to be determined if Boston is even the best team this season. Great start, but they do actually have to finish it.