No your right I wouldn`t cross to a kc whippet but a nice working whippet cross or lurcher.
you can say the above about most lurchers really , I have owned 1, whippet and 1, whippet x greyhound over the years.
The whippet was fast but a bit of a whiner and short winded really, the whippet x greyhound was a real boiler , super fast but god he was strong a nightmare on the lead, puller.
I wanted to breed a good worker which didn`t look like your average lurcher to the public, and which would walk to heel in the hunting field, until told to seek = abidient.
Watch Trixie a Novice Agilit