Why do people use help dogs?

I have a dog (Bushwhacker) I call a help dog. If I cast him alone, he will range out around 500 yards (in no sign) and then come back. But if I cast him with my "Sassy" or "Rip" dogs, he will stay with them, even if they go 2 miles. He will always be at the bay, he's not going to get too rough and bust a bay, he's just an extra hand. He can find his own hog, but if you put him with a couple more sure-nuff long range strike dogs, he will roll with them. If he's with better dogs than himself, he doesn't try to outhunt them, he's content to let them take over and just packs up with them. Now I call him a "help-dog" because he's not the calibre of my other dogs, but he can find his own hog, stop it and bay it. But like somone else said earlier, I don't have to worry about him splitting from the other dogs. By definition he would be considered a decent strike dog (500 yd range, can find his own hog), but to me he is a help dog because he's simply helping out better dogs. I could probably cast him by himself more, and make a better dog out of him than what he is, but I don't get to hunt as much as most folks, so I take the "A-team" every time. I only have 4 dogs to hunt, and he is the 4th best, but he is very valuable to me if I have a female in heat or a hurt dog. I don't need 4 dogs that can find a hog, I only need one dog to find it, but I do want extra dogs at the bay. The reason I like him is because he is NOT too independent. He fits my pack and is part of a team. I could take him with some of the guys around here who hunt "muffler sniffers" that you can always see, and they would think he's a "go-yonder" dog. What I'm saying is "help-dog" does not always mean cull. One man's cull, is another man's help-dog, is another man's ACE strike dog. I guess it comes down to what your standards and expectations are.