This whole discussion about rotations is completely worthless.
If there's anything I've learned this past decade it's that all that matters is perception and connections.
It's nice that you did a rotation as a DO with MD students from Harvard. Does it say that on your transcript? Is that written in your MSPE? No!
You are judged by how your school is perceived which is partly made up of word of mouth and the performance of your predecessors.
That brings me to connections. If during that rotation with Harvard students you got a LOR from Jeff Drazen (NEJM editor in chef) then that will turn heads and get a PD's attention. My guess is however that you rotated at some satellite community Harvard affiliate where you got a LOR from some unknown hospitalist.
Furthermore that rotation that you did with the Harvard students is the holy grail rotation at your DO school while it is undoubtedly the "easy" rotation that the HMS students who don't want to go into that specific specialty do because it checks a box with minimal effort (yet meets ACGME requirements). However, they'll then go on to a rotation at BWH, BI or MGH while you might have 8 weeks with a private practice doc in an outpatient clinic for your next rotation.
Since we're throwing around anecdotes (*cough*
@SLC *cough*): during my IM rotation at the VA (didn't think I wanted to do IM so chose it cause it was 'easier') i had a DO resident who went to NYCOM. He would tell me how he didn't have any lectures during his IM rotation (we had them daily) and never had to write up H&Ps to hand in to the course director like my classmates and I did every week. I also had friends who went to NYCOM. One of them told me that his rotation at a community hospital in eastern Long Island consisted of showing up every morning with 6 of his classmates and mostly sitting around because there were very few patients on the service and nothing for them to do.