scaly leg or hen pecking?

A week ago we added a Welsummer Cross and Welsummer pure breed to our existing Warren and Bluebell hybrids. We initially kept them apart in an adjacent run and they slept in a cat carrier for 3 nights, on the 4th night we put them all together in the main hen house after the old birds had settled for the night- no problems. However, next day and since then, the new hens will not vacate the house in order for the old ones to lay their eggs and they are sat in the nesting boxes resulting in a lot of heated exchanges and squabbling. They are afraid to come out as the old hens chase and peck at them and once they have managed to lay we are having to divide the run off in order for them to feel safe enough to come out. We have noticed, though, that the Cross has really sore legs which it didn't have when we bought them,  I assumed they had been pecked badly as they were red and blooming and the pure breed had a peck of blood above its beak, but Iam now wondering could it be scaly leg? The pure breed has one or two small sore bits too. Any thoughts? We are beginners but want to do the best for our girls!

Thanks for that, I am beginning to think it is pecking too as the Welsummer who only had a little mark on her leg ,today is more heavily marked! I'm not sure whether or not to take the two original birds out into a temporary run and sleeping area to give the new ones a break or whether that's a backward step, sometimes I've read it can help take them down a peg or two and solves the problem when re-introduced. I've sprayed them with some purple disinfectant/antiseptic to soothe and help put the others off- hope it works!

had to keep my new birds seperate for weeks !!!  Kept them in a wired off part of the run where they could see each other. Tried a few times to get them together before it succeded .
just takes time, I had 6 oldies and 6 POL .  Good luck 

  Alby