Diya being anulikas daughter at this time will not have any major impact on prerna anyway...also anurag will not refrain diya to make diya and prerna meet..as he will feel this can keep pre hate him and go away.
The revealation about diya was too casual and not to forget too early in the track...if we see the scene in pandal between anulika when it was revealed, she wanted to use it as an excuse to make anurag be close to her and be touchy...and later her monolouge about how the trophy anurag basu being here satisfies her ego..
Anurag accepting diya being his daughter is one thing but there is a reason why him not only drunk is emphasied..but he twice said ke main hosh mein nahi tha..matlab he does not remember doing it but remember mayebe waking up.together...its one track always introduced in all EK shows where the FL thinks he is the father of the main villians child but it never turns true..in S1 yes komolika was pregnant with anurags child, but never gave birth..but she got pregnant with some Subudro also, but I donāt know is she had a child or not. Point is, anurags children in story was given birth by prerna only...there is a possibility that diya still has basus blood in her and thats why anurag feels connection..not to mention the makers can very easily ignore thr connection part also...
Komolika is an out n out negative character...and EK never gives the vamp everything in all senses...right now she has it all...power, status as anurags wife..a supposed child from him...she has ruled for 8 years...but its time her world shakes now and its time for her to loose it all now.
I feel diyas partenity truth will come out and they will kick out komolika and anupre will have to come together from sneha ansd prem will be born..but komo will kidnap him and make him hare his parents ..thay will keep komolika in the story and villanious.