dear joyel,
the questions which u are posing have been already questioned by arunasur to shiv..
regarding ganesh... ganesh was given second life but not with the same head.. he got elephant head and that too because parvati was adamant and it was not ganesh fault at all at that time.. he just followed his mother words..
nandi, markandeya had immense bhakti...
do remember bhakti ki shakti is much grater and powerfull.. that is what nandi, ganesh and markenday, savitri had.. immense bhakti or pure love..
but where do u find love near arunasur.. he is so evil.. he doesnot even respect human life..
life and death and then life are cycle of nature.. if every one keeps pleading for getting their loved ones life back.. what will happen to prakruti??
thus, shiva in yesterdays episode... requests parvati to think like adishakti and not like mother...
this is just my pov dear.. show is a flop or hit... it is all becuse of writer and his confusing script