For Wales:
Taulupe Faletau (I'm not sure I've ever seen this guy have a bad game, at least not in a Wales jersey. He is the unsung hero. Dan Baker is shaping up to be a great replacement, but I fear that Wales would miss Faletau's incredible work-rate if he was not present at the WC)
Dan Biggar (the Autumn tests showed that if Biggar gets injured there are currently no obvious replacements that would fit seamlessly into this current Welsh set-up. It's a mystery how Priestland is still anywhere near the Welsh set up by now, Hook is up and down, Anscombe obviously hasn't played enough for club yet so time will tell, I would love to see Morgan get another shot at some point, Sam Davies too but needs a lot of getting up to speed internationally, Patchell has looked patchy (see what I did there) in recent times, there's always Owen Williams I suppose)
Rhys Webb (this is a similar situation to fly half, no obvious back-ups. Phillips had a shocking time during the Autumn. Rhodri Williams has potential but I feel is too much of a live wire and unreliable on the big stage for the moment. Lloyd Williams.... well, just Lloyd Williams. Martin Roberts... meh. If Gareth Davies hadn't got injured there could be a lovely Webb/Davies battle for the 9 jersey going on right now, let's hope he can pull it together in time for the WC. What has happened to Knoyle? Let's start a petition to get Peel at the WC
)
Alun Wyn Jones (possibly the single most vital player in the squad. Forms the back bone of the forwards, and the team as a whole. His passion is unmatched, he is an inspiring leader, and a partnership of Charteris-Ball just does not have anywhere near the same bite to it)
Leigh Halfpenny (I think Leigh has reminded us this Autumn why he is so valuable to Wales. He might not do anything flashy these days, which is a shame and something I think he should work on, but boy has he saved our skin time-after-time. That tackle on Etzebeth was potentially match-winning, and to see that kind of a hit being made from someone so short on such a giant was pleasing. To have two solid kicking options around the park is a big advantage too. I just feel that if Liam Williams keeps up his form he hopefully will be able to push Cuthbert out of his right wing spot. But if Halfpenny is injured before the WC, I do fear that it will be Williams at fullback and Cuthbert on the wing, and I just have run out of patience with Cuthbert, especially in defense. He's just not up to standards at the moment and is probably being selected on past glories)