we'd say that there's no real need to have functional links to user profile pages on the subscriptions. far easier to have just links to following:
Column 1:
IC OP
IC last unread
IC Last post

Column 2:
OoC OP
OoC last unread
OoC last post

Column 3:
CS first post
CS last post

and of course the "CS post you want to go to" button.

maybe buttons could be something like this?
<-- (first)  >|< (unread) --> (last)