There can be a lot of reasons for a player having an off day including injury. But a palyer that isn't willing to put his body on the line against a physical side like the Roosters pl is will always let you down in that type of game and should never be considered for the top grade.
For varying reason Parra should cut
Hopkins, Kativerata, Webster,, Kaufusi, Peterson, Muspratt, Mowbray, Ellis & Marzella.
I don't know about the following players either, and wouldn't lose any sleep if they went too, Langi, Gruszka, Thorman, Hinchcliffe, Moi Moi, Pai & Curtis.
I will probably be howled down but, based on form in pl I do not have a high opinion of these players either, Mateo, Smith (Tim) or Muspratt. The first two did look good in flegg so maybe they will improve with experience.
Just to show I don't hate everyone I do like Afamasaga, Smith (Ben), Hauraki, Oake, Reddy, Cordoba & Anderson.