Yes of course, a worn cam is possible. Lets remove the valve cover, and inspect, a worn cam is unlikely due to the roller rockers, but definetly possible. Check springs, and turn engine by hand with valve cover off while an assistant looks for anything weird. Hopefully just a valve train problem, thinking a bad spring or rocker.
A bad spring will not show on a compression test, unless you remove the valve in the compression tester, and test while running, watching the "stroke" of each cylinder.