It shouldn't be an issue. Last June, my dd, dh and myself checked into BCV and traveled there via DME. My dh had to leave 4 days later...of course, I forgot to give him his paperwork for the bus, but he had no big problem. Then, to add insult to injury, my dd and I moved to POR for the last 3 days of our stay. We had no problems whatsoever with DME and all our changes. Just be sure that your dh is listed on the reservation for DME.
We are facing a somewhat different situation next month. I get to WDW on a Monday morning. Dh and dd arrive late Tuesday evening. We are all using DME but for some reason Disney had a huge issue with this...said we all had to arrive together. DME told me that most certainly is not the case. So, we'll see what happens when dh and dd get to the DME counter that night. He'll have paperwork with him to show that he does in fact have a reservation.