This exactly. What was the point in half-assedly giving Miss Skullnick development in S1? What was the point of showing so much Sensei after it was already established that he was just what Marco would become if he stayed on Earth? What was the point in giving Jackie so much symbolism, and in placing significance on the "having someone to get to know her" line if it would amount to nothing?
Seriously, at the very least Jackie needs to show up again and GET proper closure, not give it. Tomkie anyone?