Of all the squinterns, Arastoo really had the most significant arc in season 11. The other interns were obviously essential assets to the team throughout the season. They helped with cases, and a few experienced some really compelling character development. But Arastoo hit several milestones during his five episodes. He was forced into making some tough choices and major life decisions. He found himself having to choose between his work and the woman he loves. And though it was certainly not an easy path, I think he (and his now-fiancee) are stronger for it.
As so much happened with this character in just the first two hours of the season, this will be a two-parter.