In case of a dispute where arbitration doesn't go anywhere, everyone will be sued. Having an architect on board doesn't absolve you from liability, but it should greatly reduce it. A good architect will steer you away from problems in the first place. 

Both

Everyone will be sued by the plaintiffs. If the architect has no money and no insurance they will focus on the one with the most money and insurance. Anyway everyone will be affected.

So we should only associate with good solid upstanding people when we do business. If a client keeps asking you to reduce fee and cutting corner it is better to fire the client ASAP. Life is too short .

@ David. Yes, you are very right. The irony is these a-holes taught me a few lessons on how to be a better businessman which my schools or AIA never expose to me .

My general understanding is they have to sue you; that is whom the contract is with; they can't go after your subconsultants without going through you.  The stamping engineers and architects will be named and adjoined, but it generally sounds like they are peer reviewing your work as it pertains to whatever they contracted with you.  So they’ll carry some of the liability, but you are in the ‘responsible charge’ seat.