AUSTIN — Tevin Stukel was one of the Rochester Grizzlies' top goal scorers a year ago. The Hancock, Michigan, native scored 13 times and added 11 assists, for a 24-point season in his first year of junior hockey. He did all of that in a season in which he was just 16 years old for the first two-plus months. Now, a year older — though still young by the standards of the North American Hockey League, which is generally ruled by 19- and 20-year-old…