Too many birds in the launcher can screw up the learning curve for the dog. Wild birds move around and their scent trails can wash out. A planted bird in a launcher will make for a stronger scent cone and she may be looking for just that. Leading her to birds on a check cord wont teach her to find birds on her own. Dizzy up some strong flying pen raised quail and let her go on her own, she will figure it out better if she teachs herself.Back to the check cord.