What my logic says is this..
Pischani knows that kal vijay ratan will be a reason for her end. When she failed in getting it and vidya's daughter getting it the other possibility was that guruji's vanshaj will be the reason...along with DD.
Maybe coz of this P trapped mahima' husband so that they dont have baby..(i think soš²).i mean why would she be so much interested in mahima 's husband...
Guruji might have given some powers to rakshit and may be k like DD he is also asked to keep his powers hidden and when the time comes then use it(to save DD)..
That is why i think rakshit is anjan...
Mahima already had Rakshit so it doesn't make a sense that Pi took R's father away to avoid having baby.