Its fair to say Newmans average has gone up and down more than most mainly due to injuries. We saw what he is capable of in the play offs so if he could be injury free then his average would improve quite a bit in my opinion.
I have said before i dont think Fricke or Kurtz will make gp standard but Jack Holder will in my opinion, they all have time on their side but i think Jack has what it takes although the others could develop later like Doyle has.
The problem is we dont know what the criteria will be for the averages so we can only guess, i am sure Newman will be in the team anyway whatever criteria is used.
i agree it should be a conversion like the one worked out by SCB on another thread but only for EDR's.
He scores well in the EL because he is riding against other EDR's most of the time, he is one of the best EDR's so that is no surprise is it.
He has an official PL average. It may be lower than you would expect but that is because he has struggled with injuries and took time to get his confidence back, for Poole he hasn't been at his best all season for the same reason.