Yeah this silly mentality that others have done it, therefore everyone can is harmful.
Of course you can learn in reserve grade. You are playing against other up and comers or guys who have made it and are in a transition phase in their careers.
Look at Sione Fainu. I remember people on here saying he was deadwood that needed to be cut from our top 30. He persisted in ressies and then it just clicked. We have other players who bounce between the two grades who are getting better as well.
It depends on your mentality. Are you humble enough to work on your own game, practicing what you are learning in NRL against lesser yet still tough opposition, or do you think you are too good because that’s all anyone has ever told you?
This kid isn’t ready. He hasn’t been prepared properly. He is a target and a weakness currently. Use all that, get better and come back in version 2.0, 3.0 or whatever as the player people are predicting you will be.