I do agree that it would have limited Jo’s storyline potential massively. Ironically I think this has been one of her best seasons. The best Alex exit would have been for both of them to leave together. Had Chambers given any notice of his plans maybe they could have done that. He didn’t though and unfortunately there were limited options. I think having Jo more involved in his decision would have been more realistic though ie they mystery being she disappears herself for a few weeks and comes back with the letters and admitting her and Alex both agreed he should stay leaving him status with Izzie open ended. At least that way we could buy they came to the decision together and there could have been better closure for Jo then what she got.