My take at the moment is that the backs most locked into the starting XV are:
JOC (James O'Connor) at 10, Paisami at 12 or 13 and Koroibete at 11.
White, Wright, To'omua and Banks would be the frontrunners for the other positions but there is far more uncertainty there.
Given the overall lack of experience in a lot of positions, I expect Rennie will be keen to start the test season with White, JOC (James O'Connor) and To'omua at 9/10/12 if they are available. To'omua's form is the most questionable of late but I think his experience will win out.
I agree JOC (James O'Connor) 10, and Paisami is a lock in. Not sold on Koro, but only cos I can't seem to leave out Petaia or Wright from the list.
Here's my crack at out backline:
9. White - Incumbent playing well, Tate off the bench
10. JOC (James O'Connor) - Better form then both To'omua/Lolesio
11. Wright - Incumbent playing well, and skillset balances out the back 3, can act as another FB
12. To'omua/Paisami - 50/50 split depending on style of play.
13. Paisami/ Ikatau - Paisaimi first if not at 12. Then Ikatau on form. Happy to see Foketi here too.
14. Petaia / Koro 50/50 split here for me, I probably prefer Petaia though as his finishing ability is hard to leave out. But his errors shift him to the wing for me.
15. Banks - Probably our weakest link, but attacking form has been solid. Other parts of his game never an issue.