Soha alive or dead is still a mystery !!!! Arya wants revenge coz he feels manik is responsible for sohas death. I guess he must have come to this conclusion on the basis of the media reports only..He doesnt seem to be in touch with his own father ...he tld this in yest epi that soha used to live with their father n he with mom n they had no contact for 10 years !!!! All this mystery will open up eventually.Nyo treats manik as a pawn between her n daddy M ...hence wants him fully in her control