Griffey on the DL

The Enquirer reports that Ken Griffey Jr. was placed on the 15 day DL this evening, retroactive to April 13. I don't know what to make of this. The thing that makes me the most upset is that Doc Kremcheck initially said that the injury was not even serious enough to merit an MRI, but today Griffey had an MRI, after a 5 day delay, only to find inflammation of a tendon in Griffey's knee. Why not order that MRI earlier?