Initial diagnosis was shoulder strain, out at least 2 weeks.
Subsequent MRI revealed a partial tear to the rotator cuff. He needs to let it heal before he can resume contact. Otherwise, he could tear it further, need surgery and be out for the season. Sounds like another MRI is planned for Monday to see how it's healing.
Actually, I think the Blazers medical staff do a good job. I just thought the discrepancy in the length of time between the initial report and what the reality is seemed a little odd. What you said makes perfect sense.