Yes, that is exactly what I mean. They are insanely overloaded over there at Folger Tech so it probably slipped through the cracks. I'll whisper in John's ear for you.
You did get the extruder assembly from the i3 Mega. The only difference is the wire color and the mirrored extruder. I can't see anything else different between the 2.
You are correct about the stepper direction, it will need to be reversed to use that assembly.
UPDATE: I sent John a message recapping what you have said. I gave him your email address to reference, I hope you don't mind.