I really don’t see the possibility of Draupadi being her unless there’s a direct correlation between these two, moreover she couldn’t be daughter of Nanda and Agnirasa simultaneously
It is mentioned that they were twins, where does it say that they weren’t equal in age?
Acc to HV and MBh, she was. I'm guessing Nanda belonged to Angirasa clan. Angirasa wasn't one person. Moreover, Agni is said to be Angirasa and vice versa. That explains the fire birth. There's quite enough hints that Ekanamsa/Kuhu was Panchali.
Just because everything was not a plan, it doesn't mean everything waa unplanned, either. Fact is Vyasa wanted an empire; that's clear in MBh. Fact is Krishna needed Jarasandha out; that is also clear. Fact is Vyasa couldn't build the empire without getting Jarasandha out; also clear in MBh.
To get Jarasandha out, they needed a Kuru-Panchal alliance. Krishna needed his own person in to ensure Yadava safety, and Pandavas weren't responding to his overtures as is clear in text.
Drupada needed a son as defense against further attacks by Drona. He went around to quite a few rishis before getting Dhrishtadyumna. His Agni origin strongly suggests he was Angirasa. Krishna was Ghora Angirasa's student. Narada, Vyasa's BFF, was Krishna's foster cousin. Chances are they conspired to place Dhrishtadyumna and Panchali in Panchal.
This part of the plan is easy enough because all parties would've known what to do.
I object to the idea of everything being a tussle between Vyasa and Krishna, with both keeping their respective plan a secret from others. Too many variables for that. Pandavas might have been nincompoops, but Panchali most definitely wasn't one. Actually, why would VYASA not have told her and Pandavas to watch out for Krishna?
The point being that actions have reactions unless the one doing the action/planning is alone in a vacuum. The lack of reaction from others should tell us either that they were all dumb puppets or that they were in on the plan or that sometimes, things are NOT planned.
Anyway, that's a point which has been beaten to death.
But yeah, the political alliance was planned. VYASA makes it clear when he goes to Pandavas before swayamvara. The only unanswered question is did Krishna know? I believe Krishna's actions before and after and his interactions with Panchali make it clear he not only did, he had a part in placing her in Panchal.