How is Murray ever going to get any playing time in the future?
He's a 23-year-old 6'10" forward who can't shoot 3-pointers.  The Blazers have Camara and Walker, not to mention Grant, that are ahead of him on the depth chart.
I don't care what Murray's  +/- was. He shot 1-6 (0-3 three-pointers) for 2 points.  Another G/F,  Matisse Thybulle was 1-5 (0-3 three-pointers) for 2 points.
The Blazers desperately need a Small Forward of typical NBA measurements who is dependable on defense and CAN shoot from the outside.
Other things being equal, younger is better.
Can 18-year-old Rayan Rupert be that guy?  Maybe.  Maybe not.   But he should be given every opportunity that Murray has gotten to show what he can do.