I don't know if anyone notices, but they are way out of whack. They are in different cycles in every timeslot -- I think the Friday night (10pm ET) hour is somewhere in book two-early three but the Saturday night (12am ET) run is up almost to the end. It is very odd and is hard to keep up.
Also, will Nick itself ever consider rerunning ATLA themselves considering ALoK is coming up in a few months? Or are they too wrapped up in their other crud like iCrappy and Big Time Bust?