Grey's Anatomy: Now or Never (season finale)

(S05E24) "If you're not scared, you're not paying attention." - Bailey
I took a few hours off in between last night's two hour Grey's Anatomy finale. I knew it was going to be two posts since it was two episodes and so I sat and watched the first one, wrote it up, grabbed a few hours of sleep, and woke up trying to figure just what was going to happen in this episode before I watched it. Everything was so nicely set up (the first hour really could have served as a finale too) and once again, Grey's Anatomy caught us all off guard with what's arguably its biggest cliffhanger yet.
Izzie's out of surgery with her short term memory fried, George is joining the army and went home to spend his last day with his mother, and Meredith and Derek don't have time to get married. Lots of confusion, lots of stress, and things only got worse once a guy dragged by a bus, face and body completely mangled, got brought it.
The way it all played out, as gripping and heart-string tugging as it was, you have to admit - the drama did feel a little manufactured. Take Bailey. I was convinced without a doubt that she would take the pediatrics fellowship. Nope. Throw in the wrinkle of Tucker's "me or the job" ultimatum and Miranda is a single mom, back to working normal hours in general surgery - just like Webber always wanted anyway. The Tucker thing came out of nowhere and honestly, I don't see how Bailey going back to what she's been doing advances her character, or her career, at all.
As for the the relationships at Seattle Grace, most fared pretty well. Cristina and Owen made up, as did Callie and Arizona, and Mer and Der did get married - in the locker room, by themselves, with vows written on post-it notes. Hey, it's real if you want it to be. The only relationship that sort of got left with no resolution was Sloan and Lexie, but I'm guessing she'll still move in with him anyway.
As for George and Izzie? All season long, and even somewhat before that, there's been behind the scenes chatter that both Katherine Heigl and T.R. Knight wanted off the show - material wasn't good enough, my character isn't getting enough screen time, etc. Who knows how true any of it is, but it looks like the two of them may have gotten their wish. Although it is a cliffhanger, so who knows what's next.
Izzie's short term memory loss finally subsided only for her to slip into cardiac arrest as Alex and her made up. Maybe her sudden recovery was the onset of the symptoms to come? As everyone predicted, the DNR was ignored and Webber, Yang, and Bailey tried to bring her back.
The biggest reveal? George was the John Doe who got dragged by the bus. He saved a woman (this was the role that Kaley Cuoco turned down) by pushing her out of the way and took the hit instead. Didn't even have to go to Iraq to be a hero. By then, his injuries were so severe that during surgery, George began to flat-line as well while Derek operated on his brain.
So now comes the speculation - what did the final "dream" sequence mean? Izzie was decked out in her Seattle Grace prom dress from the season two finale and George was sporting his army duds with a new close-cropped haircut. Are they dead? Was that the afterlife? Or just some sort of holding ground, sort of like when Meredith "died" after the ferry-boat drowning debacle? Was there any significance to Izzie being on the elevator and George being off it? Anyone else got a good theory?

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