what did daksh get by all this?

Not really sure. But he is not a cameo, i suppose. So he will be back to trouble shivaay and anika. His next dialog might be engagement mujhse, shaadi shivaay se in repeat mode😆

daksh s going 2 delhi...he need 2 keep shivaay n anika apart so he said about one nyt stand...insecurity 🥱 ...he want 2 keep shivaay away from anika...

If we see the episode where they showed us that he is the stalker, he says that he won't let anyone be the reason for Anika's Happiness other than him. He here has realised that Anika loves Shivaay & Vice versa.
This here is now going to sound super sadist but here's how it is. He thought that this ONS thing is gonna dilute Anika's image in front of Shivaay. If he confronts her about this. She will be really angry as it would confirm all the things she believes he thinks about her. This is what his actual plan is.
If he doesn't confronts Anika, still it is a win situation for Daksh. Becoz Shivaay would give Anika a grand ignore or may as well behave like a child & prepone his marriage with Tia.( Which happened) So in both the situations Shivaay would be out of the picture.
Now he being he, is overconfident about his game & that's why secure enough to pay attention to other things. Thinking Shivaay is out of picture & Anika is all his forever.
Even though it's terrible, his plan is well thought out. He knows Shivaay, He knows Anika even if he hasn't known her as long as Shivaay has. He knows that she is impulsive, doesn't think her decision through & may take decision in anger & trust every person who is nice to her.And he knows what a dumb head & prejudiced person Shivaay is. And he is using it against Shivaay.

Daksh isn't Tia's D... He is obsessed with Anika already... He has realised Anika has feelings for Shivaay and he has seen Shivaay has a connect with Anika... He has to go to Delhi for his mom's operation and is insecure that Shivaay n Anika might get together when he is away... He had to destroy all thots in Shivaay's mind n heart that Shivaay knows Anika well.. N he had to make sure Shivaay asks something to Anika such that Anika will be so hurt that she will hate Shivaay... That's y he played this game... Spoiling Anika's image totally infront of Shivaay... Making scenes such that Shivaay's mind will question... Shivaay will end up hurting Anika and asking her something which will hurt her so bad that she will hate Shivaay...

I think Daksh is the stalker but he is not Tia's D !! But yes it is very much possible that he came to India for Shivaay's wedding on Tia's say. We already know Daksh is from London and we also know that both Shivaay and Tia have studied/lived in London, so they must be mutual friends. It is possible that Daksh in cahoot with Tia came to India so he can spoil Anika's image in front of Shivaay, because we know from the TV show history that whenever Shivaay MU Anika he advances or prepones the wedding !!

His stalking Anika might not be about her subconsciously, it might be because he is jealous/competitive of Shivaay and wants whatever Shivaay desires?