I got SO sick of hearing how GIANT the welsh backs were. They still missed about 6 tackles on Manu between them! As for South Africa, Willem Alberts is a worryingly big guy for an openside flanker....our 6.5's will have their work cut out with him! Interested to know what kind of 7 he is though, as he doesn't seem to be typical physique for an openside.
Otherwise, there are some big guys out there but we're hardly a small side. Morgan may be called upon to make a lot of carries as he's one of few natural big ball carriers. This said, it hasn't been a big problem for us so far under Lancaster. We have a team of reasonable size who shift the ball around the bit amongst forwards and get going forward that way. I'm pretty happy with that approach to be honest.
We'll rely on Farrell no doubt to put us in the right parts of the field - no sense in having an arm wrestle in your own 22!