Think it's just a body type mate, although i guess that feeding in those cases must have an effect.
Thing is, although lean, i think of the greyhound types as strong and muscular.
I have an albino, greyhound type jill here, but her sister (poley) is much stockier, although weighs less over all.
I put the albino to a hob of mine who is similar boy type, lean etc, although also a big lad.
I am keeping kits from the litter and it will be interesting to see what size/shape they turn out.
Yes be very interesting , you got any pics of the hob and jill ???????