first of zll who cares, everyone got to see spongebob. second of all there are other things you should consider:
1. Zoey 101 didnt air in the US because of Jamie Lynn Spears' pregnancy, something that Canadian channel probably doesnt care about.
2 Danny Phantom was having trouble getting their show aired because they needed to find a way to make a series finale because nick wanted to stop the show because it didnt have a big enough fan base. As Told By Ginger and All Grown Up probably have similar fan base problems, especially in the US.
3. All Grown up stopped being a main nickolodeon show after that one tv movie thing.