Debid, I bet you have hatchery Welsummers. They should not have thick legs with spurs unless you have scaley leg mites or one of the unfortunate Welsummers. If they are hatchery or have hatchery lines to them, I am not surprised.
The spurs in hens are usually comes from a mother that is dominant in having leg spurs herself. She will pass most of that to her female offsprings.
The breeder/show exhibition lines of Welsummers are not that flightly, more like aloof in most cases and not really too afraid of humans. I find them gentle particuarly the roos which it is very highly desirable and trademark of the breed. If you got a mean one in both males and females, I would NOT ever breed them. With hatchery Welsummers, its crap shoot to get the type, disposition and egg color.
I don't know how many times I've heard people going to order Welsummers from hatcheries ended up being disappointed, just too many when they found out WHY the faults, flaws and not what they predict it expecting it to be a Welsummer. Even one ordered a Welsummer, got a Brown Leghorn instead.
If you want eye candy, lay lots of eggs, and don't expect too much out of the Welsummer's traits true to form, then hatcheries are the way to go.
I've had Anconas when I was living on the farm, they are bigger than Leghorns but just as flighty. Good for heat but in the winter, their combs would be frostbitten.