Yes - part of the delay was due to an erroneous email. My understanding, after talking with the agent, was that it was a typo on Mason's side. The more concerning error was that they made a calculation error on the closing documents, and I had to wire additional funds at the eleventh hour. When everything was finally corrected, I asked if my date could be accelerated to make up for the lost time. Mason was non-committal in their reply, and they did not accelerate the date.
It just seems to be luck-of-the-draw, based on my limited resale purchase experience.
I don't have a bias towards either one - I'm typically driven by the best price contract I can find. Then, after seller agreement, I just try to keep the process on track as much as possible. Prepare for the Worst and hope for the Best