quite interesting question ashish,
here it goes as told by a lawyer specialising in divorce and property cases:
He has not come across a single case like this , so there is no precedence for resolution of this case.
Now in the current scenario if the first spouse was dead (body incorrectly identified or any other case as shown in HD), then in that scenario the death certificate would have been issued and the spouse can remarry and marriage will be legal till the second spouse comes back.
now after 7/8 yrs if the declared dead spouse comes back then that spouse has to go to court to prove that he/she is actually alive giving all the circumstances on where he/she was for 8 yrs. the burden of proof will be onhim/her. Then it will actually depend on the surviving spouse which marriage he/she wants to be considered legal. if he wants the first marriage to be considered legal , then the second wife can file for maintenance. If he wants second wife to be considered legal , then the first wife can ask for maintenance.
but this will certainly be the first case of its type, so HD is going in new territory. also since only one marriage will be considered legal , then other spouse can certianly file for maintenance if there is no wrongdoing/fraud done by them.
Additional points that can tilt the court decisions in one parties favour:
If any party had done fraud in getting a wrong person declared dead/
Is there any husband wife relation between the husband wife of the second marriage and do they have children from second marriage
has he husband/wife whose spouse was declared dead actually done any fraud in the entire matter.
and the lawyer actully told a list of 8-10 other things which will be considered,while deciding the case.
hope this helps in further clearing your understanding