As for the rest, what Cubase calls
Linked Channels seems to be the equivalent of
Groups in Logic. Though in Logic, you can also hot link channels temporarily by simply selecting them. Which to me makes sense - if I select multiple elements, it's because I want to perform an operation on all of them.
Tracks which are part of a
Group in Logic can be individually routed to as many outputs and busses as you have, or to the same output.
From what I remember, Sonar worked similarly. Grouping didn't mean bussing. The difference in terminology is one of the reasons why things get so complex I guess.