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I could be wrong, but I think of "sport" colors in chickens like a "crop-out" color in horses. Every now and then you get one that doesn't throw what you thought. I think it would still be a splash color, but because it wasn't expected from that genetic pairing, it's called a sport - (or crop-out).
No, when you breed a blue over a blue, you can count on getting around 25% splash or sport, everyone has their own terminology on it...they are expected, that is why a lot of people dont breed blue varieties, and even fewer breed blue over blue. You breed a brown red to a lemon blue, you only get brown red and lemon blue, no sports, you only get sports with blue on blue, or if you breed a sport to a blue, or sport to sport...or splash, however you prefer...
Thats the first time I've heard of a splash being called a sport. I've learned it as being black or white that crops up out of a wheaten line. Then there are throw back patterns like you get in game fowl. Splash is normal when breeding blue to blue. I am one of the breeders that does not breed for splash in certain breeds like my cubalaya and asil.