While Nikita Zadorov and Mikhail Grigorenko are certainly the biggest pieces headed to Colorado in return for Ryan O’Reilly and Jamie McGinn, make no mistake, J.T. Compher is a valuable piece of this Avalanche blockbuster trade. J.T. Compher is a 5-foot-11, 184 pound forward who can play both center and wing. Don’t let his smaller stature fool you, however, he…