A rumor that is supported by the fact that when the sticker comes off the mini-rage brushless motors, they have the same green anodized can as the Castle products. Doesn't mean anything more than they may have used the same motors then.
Other than that, I've yet to see any real similarities between the two companies products.
rD Squared-MW Designs-C and R racing
Final Thoughts RC club R.I.P.