I did a little digging myself, and found out (by way of Google) that Learning Curve became associated with Ertl about 3 or 4 years ago.
The bottom of my 2007 National Show tractor says, "(c)2007 LEARNING CURVE BRANDS, INC. Ertl is a trademark of LEARNING CURVE BRANDS, INC."
No mention of RC2 anywhere.
I thought you might know about Universal Hobbies, since you keep up with TTT a lot. I think they might be hooked up with Britains, and they are all hooked up with Ertl somehow.