Glade Riven
Adventurer
It may have even been cancelled because he was offered a better deal with Sony and is moving on. A show like Sym-Bionic Titan could rapidly deteriorate without the original creator being involved. The last couple of episodes do seem geared towards a rapid conclusion, filling in as much as possible about the 3 main characters and the full story behind everything. Since these things take time to make, my guess is that Tartakovsky knew this was going to happen for quite a while.