Just what are you thinking here? Please explain.
From what I can see, that really doesn't make much sense considering what we know about the show.
Fluttershy used to be fucking pathetic, and she was stretching out for any protection she could get, whoever could give it to her. She even hung out with animals instead of ponies.
RD on the other hand didn't even seem to care she happened to be that "guardian angel" in Fluttershy's eyes, at least not at first. She didn't take any personal satisfaction in Fluttershy adoring her, for RD it's all about doing the best and being the best she could ever hope to be. RD is always pushing the limits, because if she fails, or reaches her limits, her entire reality will collapse around her.
If you see things another way, please elaborate.