There's more to basketball than basic statistics. It's 2022, and we have much better ways to evaluate players. Here are the main differences I see:
1. Don actually didn't improve much in his first 3 years as a pro. He made a major jump in his 4th year, before then, he wasn't nearly as good. Sexton obviously hasn't gotten that opportunity, but it's a little unfair to compare players right before one player made a massive leap.
2. Don is bad at defense, Sexton is much worse.
3. Don is one of the best offensive engines in the league. He makes his teammates so much better with his ability to cut the defense and kick out to shooters. The pressure that Don puts on the defense with his ability to pull up from 3, attack the rim, and also kick out to 3 is what separates him from Sexton most IMO.
4. Don's offense is much more self created. In Sexton's 3rd year, 47% of his baskets were assisted and 42% of his 2's. For Don's 3rd year, 33% and 31%. So no, they did not get their offense the same way.