I think that's pretty much the norm in a lot of businesses, not just medicine. When a college student helps his/her professor write a paper and it gets published, the student rarely gets any credit. If an attorney writes a paper--that was reserached by paralegals and summer associates--they don't get much credit, right? I don't think most renowned surgeons would give credit to their 2nd year residents. It kind of reminded me of the episode last season when Burke was featured on a magazine and he didn't credit Cristina at all with helping him through his hand crisis. The colleagues (other doctors/lawyers etc.) KNOW that there were other people involved in the research, but that without the lead person (in this case Shepherd), it wouldn't have happened. Meredith wouldn't have had the clout to start the project with Shepherd agreeing to oversee it.