Henry, mmyeah interesting what you're saying but I don't see it as concern for Wales. Having huge backs has worked more often than not.
Just against Italy the other day, Wales only gets through because Roberts is a 110kg monster at midfield.
Last year, France and Wales play a hugely intense game with immense defense on both sides, North only scores because again he's a 110kg monster.
Roberts, North, Cuthbert, Davies...even Philips at SH. I know this is getting old from my part, but it's still isn't less true: no substitute for pure mass in Rugby. That formula works, and will continue to work. You can't just "figure out" Wales and know you'll defend well and win, there's not much learning from defending massive frontal impacts. Guys like Tuilagi and North and Roberts are gonna continue to break with consistency because they're on good teams with other concerns for the opposite defense to get their hands full from, and 110kg in a back is just gon make breaks homie, always and always and forevermore.
Gatland understood that very fast, and has utilized it perfectly.
IF Wales win the ***le again, some will still continue to point out and criticize the one-dimensional-ness. If they don't, it will be even more reason for those same critics to point out that Wales are one-dimensional, but regardless of either case it's not a flaw but a quality, and a quality only. The huger the better, just so long as they're mobile and have some sense of Rugby running. Roberts ain't exactly an athletic grace to watch, he runs straight and breaks tackles...period.
So in conclusion, that's by far their best bet for 2015. They're not going to change the whole culture of the team they'd been building since late 2011 and develop Wallaby-like flair, and those guys are young enough, and that's what they should - and will - use for London 2015.
EDIT: oh so G.Jenkins is back for Wales. Good, Ireland will be truly tested in the scrum with a fully healthy front row for the visitors.