More games are decided by a THP's performance at scrum then a THP's performance around the park..
Absolutely. Although Super Rugby has seemingly bucked that trend a bit in recent years insofar as teams have done OK when the scrum has been iffy. But that's more a reflection of what the pack is doing in all facets. Tests are somewhat different. All things being equal, I'd rather the THP is a rock than a show-pony.