I'm going to play devil's advocate . . . And I'm going to say that there is a good reason for the canister filter.
Seeding, or keeping it running, on the main display system could be extremely beneficial. In doing this a QT or HT could be set up very quickly, by simply moving the canister over to the QT/HT system. Of course, I would only run Matrix (or similar bio filtration media). The same could be said, of course, for a bio-wheel filter.
That said, it is obvious that the canister filter is not required in the capacity it is being used.