I like Will Barton. Problem is, he is gonna hit unrestricted free agency next summer.
As things stand right now, our payroll for the 2018-19 season is $107,433,526. That's without Smart and Baynes. According to Shams Charania, the luxury tax threshold in 2018-19 will fall at approximately $120.8 million.
$120,800,000 - $107,433,526 = $13,366,474 to sign Smart, Baynes, our first rounder and possibly the Lakers first rounder as well.
Adding Barton would only make things worse. Not sure whether the owners would be willing to pay both Barton and Smart.