Riding a bike doesn't mean someone is automatically at fault, or not at fault. It depends on the facts of the accident. I have successfully represented many motorcyclists in personal injury claims and the fact they were on a motorcycle didn't enter into the determination of fault in my opinion.
In Ohio it is very, very difficult, almost impossible, to sue your employer for a work-place injury and without more info it is hard to say. You probably are limited to your work comp claim . Your work comp lawyer should be able to give you advice on this issue. If you don't have a work comp lawyer you should get one.
You didn't say when this occurred but there are strict time limits under which you must act or lose your rights. I would suggest you start by making an appointment with a good workers compensation attorney in your area and do it now because it sounds like there may be grounds to file a workers compensation claim under the law of Ohio, even if you no longer work at the same place.
You should get a local lawyer. They should be responsible for your damages. I agree the longer you wait the harder it can become to be successful. Take pictures and make some notes about what happened so you don't forget any important information. You shouldn't wait any longer as they are already jerking you around.
Make sure there is no insurance. Fill out the State of Ohio accident report on the BMV website. Remember if you go to small claims court to include any medical bills,lots wages and other damages you might have. Once you get a small claims judgment you cannot go back and ask for more.
Michigan is a"no-fault" auto insurance state. There are special laws that apply concerning payment of damages which are different than the laws of Ohio. With the types of injuries your husband suffered, do not delay. Get a personal injury lawyer familiar with Michigan law.