At first blush, you don't have too much to be worried about. People change jobs, this is a fact of life. Unless you are in a rotational program or management training program that runs on rails and is a totally known commodity, it is not anyone else's place to say what you should or should not have done. That said, the "find what I love" sentiment is typically not a great one in MBA applications, especially as it pertains to your pre-MBA path. Post-MBA, sure, you can tie in your passions with your long-term goals. But you want to lean towards pragmatic rather than idealistic when you assess your progress. It's why schools ask you to define your goals, state your progress, assess your prior steps, list your objectives, etc. They rarely ask you "tell us your dreams." I'm obviously exaggerating the point because I know that's not what you are saying. I guess what it comes down to is this: if you had chances to gain more responsibility and have better opportunities, why do you need to offer any additional explanation?
As for how to "spin" your layoff, contracted rehire (of sorts), honestly, that is the kind of thing we work on with clients all the time, but everything happens in context and it comes after a lot of other hard work has been done. To offer you a snack size piece of advice on something complicated like that is a disservice. If you are looking for great admissions consulting though, you are in the right place.
Hope that helps.
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