@Tod ********
I think Brandon meant about leaving the country before getting the MOE letter and documents, since he says leaving the country during the process could create issues.
However, even if OP gets the documents in time, he got his extension Tuesday, so he wouldn't have the needed 15 or 21 remaining on his extension to do the switch to the ED visa. Difficult to say if getting a new VE would or wouldn't create issues (different visa, entry stamp, and TM30 than the documents).