I really feel like you didn’t read the article. It talks about how much her character grew and changed. Once she found Isaac and Scott found Kira, they both gave their nods of acceptance at the blacklight party. They knew it was time to move on. And when Scott first found out about Allison and Isaac, through Isaac, Scott was extremely jealous. Jealous enough to throw Isaac (an abuse victim) into a wall. Twice. Allison went from being an oblivious happy teenage girl, to a powerful leader. A warrior.
I am glad that Crystal can move on to bigger and brighter things, though. Her character was shelved a lot this half of season 3. They could have given her a lot more depth and development. But I guess they knew she was leaving and they didn’t want us to get even more attached.
I am respecting your opinions, but I felt like that needed to be said.