Changing jobs before MBA

Have been a consultant for 4 years at Big4 and just got into T10 MBA program for Fall start. I want to pivot to investment management (have no financial experience) and have an offer to be an financial analyst Amazon. Could use the cash + financial experience, but wondering if it is faux-pas to take a job and leave 9 mo. later? From the POV of future jobs? Or frowned upon to go back to an Analyst position instead of staying around to be promoted to Senior Consultant at my current job.