My understanding is that there was also a reversal of promises, and investment in assistant and recruiting budget that did not happen. The actions of Barnes spoke to his lack of endorsement of Dixon.
If you had a job that you liked, but one where you were not allotted the resources, where your boss was removing responsibilities from you that you've had for 10 years, and suggesting you change your style even though he had never actually done that job, and despite you being the best person to have that job ever were losing the support of your bosses and their bosses, and a vocal fan base who thought that ANYONE could do better than you, then you'd probably take the sweet job that pays more, pays those who work for you more and increases your operating budget to do the same job.