tamalai,
Last words (Promise!!)
No you can't force someone to employ anyone. HOWEVER, once an employer HAS employed someone, that person obtains certain legal rights as an employee (and these vary from state to state) and the employer takes on legal responsibilities. Among these is the right not to be dismissed in contravention of the laws of the state in which the person was employed.
The fact that any other parties (especially when their action was under a different states laws) have accepted a settlement has no weight whatsoever in a particular individuals case.
Your statement in quotaions appears to be some legal principle you hold as universal. Under which statute is the AGGRIEVED parties actions after the fact a mitigation to damages incurred?