A lot of people blaming the plaintiff attorney here when all he's doing is properly advocating for his client. Blame the laws, not the lawyer.
I'm a former claims adjuster who's dealt with both employer liability claims and vehicle fatality claims. Employer liability is what covers cases like this, when Workers Comp is limited in the restitution it can make to the victims family, and there's clear negligence on behalf of the employer (in hiring someone who wasnt capable of doing the job safely and didn't have a license). Sadly, in many states employer liability is extremely limited. I don't know the statute in Michigan off hand, but it wouldn't surprise me if it left the employee no recourse in suing the boss.
Now as far as the vehicle owner is concerned, keep in mind that when suits are filed like this, generally speaking anyone who may have contributed to the negligence is involved as well as as any party whose insurance coverage might be triggered. Car insurance is tied to the *vehicle* not the *driver*, so that coverage is triggered regardless of who was behind the wheel. HOWEVER, as others have pointed out, that insurer will immediately seek indemnification from the business to which the owner passed over care, custody, and control of his vehicle. This happens all the time in suits like this. It's extremely common. I don't know about the particulars of that indemnity, but it seems like it would be fairly cut and dried.