Hello Waterway and welcome to the family, so glad you decided to join us and we look forward to hearing more about you and your greys.
So you have 2 greys now and they are going to the corner of the cage and kicking their legs, sounds like they are doing the chicken scratch, thats what I call it and young greys will display that behavior. My Josey does the same thing and it usually means she wants to come to me, her wings are clipped and she cannot fly so she is begging me to come and get her. Your new baby is just copying his behavior.
Take a few minutes and read thru the many threads for lots of useful information and do not hesitate to ask questions you may have. We will do our best to get you some answers and help you in any way we can.
If you have some pictures of Pepper and Noki you would like to share with us we would love to see them.