Kelsey Russo's column in The Athletic about Sexton not getting a contract extension by the deadline clearly indicates the Cavs are not convinced that what he does results in winning.
And our conversation was, in order to impact change, we have to impact winning. And our play, our coaching, everything that we do has to have an impact on winning. And if you do those things, the respect you gain around the league comes. The finances come because that’s what everybody’s looking for. Everybody’s looking for people to impact winning. So that’s what our message to him has been to go out there, show us how you impact winning, and help us become a better basketball team. - Bickerstaff
IOW, after three years they're still not sure that what he does "impacts winning", and they're challenging him to prove that it does in order to get paid.
That next step for Sexton is to use his offensive profile and help turn it into wins for Cleveland. Sexton sees the best way for him to impact winning is to compete on both ends of the floor.
Sexton’s offensive production aligns similarly with a number of players who earned contracts, like Young and Doncic. Young averaged 25.3 points per game last season, shooting 43.8 percent from the field and 34.3 percent from 3....Doncic is averaging 25.7 points per game for his career on 45.7 percent from the field and 33.1 percent from behind the arc....
But one of the biggest differences between Sexton and players like Young and Doncic is being able to use that offensive production to help his respective team win games. It does not fall on just one player alone, but the overarching ability to help win games plays a factor....
Through his first three seasons in the league, Sexton saw some of his statistical numbers increase, from his average points per game to field goal percentage, steals and assists. Yet, so did his average turnovers. His 3-point percentage trended downward over the last three seasons as his average attempts increased.
His role changed over his first three seasons, from starting as point guard during his rookie season, to shifting over to a shooting guard once Cleveland drafted Garland. The Cavs have worked to balance two primary ballhandlers in their backcourt, but the success of that backcourt has ebbed and flowed over their two seasons together, especially on the defensive end of the floor. Sexton focused his individual growth in his shot selection, picking his spots and improving his percentages. He’s also grown in his reads, noticing passes to his teammates and looks that defenses are giving him. He’s picked up on what opponents are doing to switch so he can adjust in the moment....
“I take it as motivation,” Sexton said. “Just to continue to get better, continue to learn and continue to improve. At the end of the day, I know what my team needs from me and I know what I have to do to even take that next jump to get to the next level that I want to be at. So I’m gonna go out and just continue to play, and play my game and play hard on both ends of the court and just continue to prove and show what I can do.”