Mass Effect 3 Creative Director Defends From Ashes DLC

The news that Mass Effect 3's "From Ashes" launch day DLC will include a lore-centric companion and will cost most game owners an extra $10 has incited Internet rage ranging from editorials to videos, and that's prompted creative director Casey Hudson to jump on Twitter in an attempt to defend the decision in these two tweets:
It takes about 3 months from "content complete" to bug-fix, certify, manufacture, and ship game discs. In that time we work on DLC.

On #ME3, content creators completed the game in January & moved onto the "From Ashes" DLC, free w/ the CE or you can buy seperately.
So they didn't even start working on the Prothean companion until December, after the game was finished? Considering the implications of such a companion, it seems hard to believe that he/she would be added as something of an afterthought.