Yeah I feel like they are focusing on one specific character per show, which is giving it a unique twist. And I believe Arizona was originally supposed to be on for only 3 episodes, but she stayed longer. Like Addison (she was only supposed to be around for 5 episodes - and now has her own show!)
Teacher, great comparison on the love word with Callie. I forgot about that scene with George. Seems like things are finally going right for her. I love the new hangout place of Christina & Callies apt. I was trying to figure out why they were all there at the start, til I remembered Christina & Callie both lived there, and that Owen was obviously w/ Christina and Arizona with Callie. and then Mark and Lexie visiting from across the hall. It's a great new location, now that Mer's is the married couple's house. I feel like they will fade a bit into the background.
I think they are going to focus on Hunt or Alex or Yang soon - or maybe one of the MW newbies. And each of those would be good. I saw the previews for this week's episode - it's a shocker! I love this season and the new life that Mercy West breathed into it!