I've actually noticed the smallmouth & largemouth using the carp to help them feed before. Has to be clear water but if you sit still long enough you can watch them come up and start rubbing their noses on the walls posts and pilings to dislodge the vegetation which they then eat. Sometimes you will see more than one bass hanging out a few feet below them. When the stuff falls below the carp the bass will nail it.

Most of the fish I have seen/caught past 2-3 weeks have been in groups. Lots of doubles with the fishin buddies and more often than not you will see another one following the fish you have on your line as your reeling it in.