The question should be, could the ISO crazy young Celtics be persuaded to follow a script of ball movement, team first basketball? It may take a few points off individual scoring averages and lose certain players endorsements. I'm not so sure this team would tolerate that.
I do not believe it was a lack of willingness or character or selfishness that has created the iso-heavy offense of last year. Instead it was two key elements:
(1) A lack of quality passers around Tatum and Jaylen. Particularly the lack of big man passing (and under-utilization of Rob Williams as a big man passer by our coach) and the lack of playmaking wings exposed by the lack of Gordon Hayward. You can't have good ball movement without good passers. There was a lack of talent here rather than a lack of character.
And a lack of quality shooters around Tatum and Jaylen. Shooting enables ball movement because it stretches the defense out and creates more space and superior passing angles. The lack of shooting allowed opposing teams to clog things up for Boston's offense and only worsened / highlighted the lack of shooting & passing talent.
(2) Tatum and Jaylen as a young players have games more keyed around individualistic offensive contributions (shot creation) than team offense based (passing, shooting, movement) contributions. So their games are naturally more individualistic and are trying to develop into more team orientated players although they will likely always be more slanted towards individualism. And this is normal both for young players in general and individualistic orientated players.
Both guys have shown a willingness to work on & develop their ball-handling and passing. It just not their natural games. Scoring is. So it is a work in progress and takes time and lots of it to develop these skills to a high enough level.
The key is not to slam these guys for things that are not within their current skill-sets but instead to surround them with teammates who help compensate for this. Extra onus on passing and shooting - guys who can facilitate the offense and make their lives easier as they continue to grow.
Last year's team was a direct failure in this regard.