I reckon Stephen Knight & Brett Heady only really played hff.Whats the point of doing it for flankers? Roger Woodcock was the last bloke I remember only being able to play half forward flank and nowhere else.
KPPs and ruck are the hardest to replace because they need size and weight to play there succesfully. Look at Tommy Jonas we forced him to play on blokes that were 8 to 12 cms taller and 10-15 kgs heavier than him week in week out in 2013 and it eventually caught up with him. But in 2014 we have 3 true KPDs and he has a great season as he played on blokes his height and weight or less nearly every week and beat his opponents and had a great year.
We also dont have every flanker positiion with only 3 canidates for that position and every one of those positions one of the 3 canidates subject to a potential long term ban from a CAS ruling.