I had the same questions. I and after 35yrs working for the same healthcare system, I was terminated. I was used the 90 WC leave, then applied for a personal LOA (which could be granted or not and my job could be filled ay any time during this LOA) and was given a 180 day. In the midst of all this I applied for accommodations with the ADA...and was denied by my former employer. When the personal LOA expired I was terminated. My attorney explained yes, they can do this...,but they I still have an open WC case and my former employer is still responsible. He also said at some point they may want to settle. This is in Michigan..don't know if all states are the same.