Completely fiction. Clearly there is no similiarity between castle's esc and Tekin's. Brushless motors can all look the same since there aren't thousands of places that make them. Look at the Trinity and the Reedy Neo series. Earily similiar when you take off the stickers... Castle has never been one to cater to the serious racer. Tekin is in that market clearly as well as the general hobbiest. This whole rumor started when Tekin's 1/18 Mini Rage motors just happneded to have a green can. If you were to contact any of the brushless motor manufacturers you could ask them to make them whatever color that you wanted, just sign the contract for the order and you can have purple ones! Tekin has posted some "naked" pics of their esc, look at it compared to the Castle and you tell me what you think...