UNLV basketball coach Josh Pastner keeps adding to his roster for next season. And the latest addition needs no introduction to local fans. Sebastian Mack, a former Durango and Coronado standout, is transferring to the Rebels from Missouri. Mack was a four-star prospect and the top-ranked Nevada player in the class of 2023 by 247Sports. He was a Top 60 player nationally by Rivals.com The 6-foot-3 guard began his collegiate career at UCLA, where he started 31 games over two seasons while averaging 12.1 points as a freshman and averaged 7 points and 16 minutes a game last season. Mack averaged 24 points, six rebounds and 5.5 assists as a senior at Coronado. Coming out of high school, Mack chose UCLA over Florida State and Oklahoma.…