A raptor is a bird of prey, like falcons, eagles, hawks, etc. That is where the VelociRAPTOR got its name--it resembles a bird. Go figure.
Anyway, themeing wouldn't hurt Raptor, but it isn't a necessity. Certain rides work well with themeing better than others. B:tR almost needs themeing, because the name of the ride is not one of my favorites.
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That's my take
-ED
Reason #7036 to love coasters: Even your standard looper pulls more g's than the space shuttle.