I don't think the realtor matters to Disney...but I DO think some realtors understand both the marketplace and Disney policies much better than others.
We used TTS and it made the difference between passing ROFR and not. I would have offered a dollar less, but my TTS agent said it would not clear ROFR. We made the right offer, and in the same week two other deals were taken by ROFR at the price I was going to offer.