I did think the Legends Groove was a cool looking little mold, though. I hope he gets repainted into someone else. Or heck, if I ever happen to see him in stores and there is nothing else I need that day, I may just give in and grab him to use as a stand alone figure. But he shan't be a priority.
Likewise for Rook, although I am sure he will be remolded into someone else eventually. Of course, if his remold is for the Combatacons, I may be out of luck, since I am planning to stick with the Combatacons I already have. (Fansproject augmented Asian Exclusive re-release of the Energon molds.)
I suppose if I happened across both Rook and Legends Groove in brick-and-mortar-land, I could pick them up and have two different configurations for Defensor! But whatever. I shan't be going out of my way for them, and I won't loose sleep if I never get them. But I shall keep half an eye out.

In non-Defensor news:
Man, I think Hasbro wins on the Powerglide front! The white circle around his faction symbol on the Takara version just looks so out of place!