You never once specified that you were talking Franklin only, yet...
It is not very common for coordinators to be fired in the midst of a plus season in what nearly every pundit or poster expected to be a rebuilding year.
However, I found you an example. It has occurred. Less than 365 days ago.
People can speculate on Rahne all they want. Nobody is going to be right, nobody is going to be wrong. He didn't get fired, there are no quotes about it from the perspective that mean anything.
However,
1) a coach who, 24 1/2 months ago, said he had no desire to be a HC took a job as a HC while
2) his replacement was given more money to do what he labeled "his dream job"
https://www.collegian.psu.edu/football/article_65ab8f50-e284-11e7-a553-e30ef83692f0.html
Take it for what it is...