MR of some sort for you?

EF also shows J9 and Y9 so there is still lots of availability. By any means not an accurrate way to judge, the seat mapper on Delta.com shows 22 seats in J available on your flight.

We missed each other by 2 days. I'm on the 744 flight, LAX to ATL on 10/29!

You should be fine as a DM, more then fine.