I think people are reading too much into the use of Choice. He got used a lot this weekend because he's a similar runner to Fred. Big and runs between the tackles, while being able to pass block. Those are 2 things that Spiller isn't as good at. With the loss of Fred, Gailey needed a big back and picked up Choice.
If it were Fred in there, chances are some of those drops and misses would have converted, and people would be complaining about not using FredEX enough. Looks like Gailey is really focusing on trying to be able to use 2 different style backs for next year, it just happens that our good power back is on IR right now.