What thought process has been put in to how the throttling of 'discussion'-style comments affect the pagerank of a particular post? If a bunch of moderate-quali

What thought process has been put in to how the throttling of 'discussion'-style comments affect the pagerank of a particular post? If a bunch of moderate-quality comments have the effect of bolstering the pagerank of a post until a highly insightful comment comes along that'll be upvoted to the stratosphere, then will we risk losing those interesting discussions simply because there isn't 'that one right person' there to seed the bigger conversation with insight?