Tennogen doesn't transfer, and I can tell you why;
ALL Tennogen purchases are through Steam, and thus, use Steam's economy. Correct me if I'm wrong, here - but DE gets a cut, Steam gets a cut, and the creator of the content gets a cut.
You can't just immediately eliminate Steam from the cut, there - PLUS, you'd screw hundreds of content creators out of money they could rightfully earn. Nobody wants to screw over the little guy.
Sorry, but Tennogen doesn't, and will not transfer - and for very, very good reason.