People who think rotating weight is more important than standard weight are wrong. Yes, technically, it requires more energy to accelerate something that is rotating than it does to accelerate it in a straight line, but if you actually do the math instead of just kinda sorta remembering what you did in high school science class, you would see that it's insignificant.
I can spare you the nerdy details, but I have them if you want them. Losing rotating weight is no more useful (that is to say, not very at all) than losing standard component weight. So PLEASE stop talking about it like you understand science. If you did, than you wouldn't be.