Sheesh. Nobody actually answered the question. Are we 5 wins better with these three players? 10 wins better? 15?
Let me make two assumptions that I do not believe would be true (1) that they develop as well here as they have done elsewhere (2) that we have a quality head coach.
In this case, I would consider this team a title contender.
C: Rob Williams, Horford
F: Tatum
F: Jaylen, Josh Richardson
G: Haliburton, Herro
G: Bane
They'd need to trade Smart. Clear out the backcourt minutes for the other three guys who are all legit shooters. Their shooting is key to Boston's postseason hopes. Need some filler at forward but yeah that team is a title contender.
Herro is a notch below All-Star level. Haliburton is probably a top 50 guy and Bane isn't far off that level himself. Those 3 guys would make a massive difference in terms of the level of individual talent on the team.
They would also make a massive difference in terms of chemistry because of their individual and combined shooting ability which would turn Boston from one of the worst shooting teams in the league into one of the best.
I mean, look at that backcourt - that shooting is exceptional. Look at Jaylen and Tatum as forwards rather than wings and the massive shooting advantage we have there versus other teams in the league. 1-4 we are one of the finest shooting teams in the league. It is phenomenal.
That is why they are a title contender.