I think people are getting too fixated on 1-17 being Potters first choice line up
If you read the T&A report, its the reporting saying that 'it would appear' that these are the first choice 17, there's nothing specific from Mick Potter at all.
Obviously, Tom Burgess is going to on the bench as the fourth prop over Sibbit. So that shoots down the idea that these are the first picks.
I'm not worried. I expect Sammut or Briggs to force Jeffries out of the 6 position, assuming they play well. Perhaps giving them other squad numbers was a kick up the pants for them? Who knows. And, BTW, wasn't Briggs something like No 32 last season, so at least he's got a lower number this time