Not that it excuses the poor performance from Wales, but it's very generous to call that a 2nd string side, certainly in the forwards. Imo it would read something like:
Smith: 3rd choice behind Rob Evans & Gethin Jenkins. May quickly slip to 4th choice if his scrummaging doesn't improve.
Dacey: seems to be 2nd choice in Gatlands eyes, but I'd personally have him down in 4th behind Ken Owens, Elliot Dee & Ryan Elias.
Leon Brown: 3rd choice behind Samson Lee & Tom Francis. A fit Dillon Lewis would prob get the nod as well.
Beard: 4/5th choice at least behind AWJ, Ball & Hill, maybe Seb Davies as well if he was played in his correct position. Easy to argue Charteris should still be there ahead in the pecking order, so too Bradley Davies.
Hill: 3rd choice.
Lydiate: Should be 4th choice behind Warbs. Moriarty & Shingler, though gats may have a different opinion.
Sam Cross: 7th choice at best behind Warbs, Tips, James Davies, Ellis Jenkins, Olly Griffiths & Thomas Young, whilst I'd go further and have Navidi, Boyde & Sam Lewis ahead of him too.
Seb Davies: not even a no. 8, so difficult to judge. Not much depth, but still at least 5th choice behind Faletau, Moriarty, Dan Baker & Harry Keddie.
Webb: 1st choice.
Priestland: I'd potentially have him as 1st choice, but he's possibly behind Biggar & Anscombe for Gats, whilst there's not much in it with Patchell.
Amos: 4th choice behind North, Steff Evans & Liam Williams.
Watkin: Difficult to judge, since it's a new start at 12 for Wales. Behind Owen Williams....
Scott Williams: Clearly behind Jon Davies, whilst Tyler Morgan and possibly North would have started at 13 ahead of him if fit.
Alex Cuthbert: where to start? I'd have way, way down the pecking order with Steff Evans, North, Liam Williams, Amos, Halfpenny, Keelan Giles, Tom James & Ashton Hewitt all ahead of him. But Gatland just refuses to see it that way; even so he's realistically down in 5th choice even in Gatlands eyes now.
Liam Williams: IMO 1st choice, but probably still 2nd choice in Gats' eyes.