Flowey's identity (spoiler) [closed]

Warning : this question will involve information contained in the True Pacifist run of Undertale. So be careful before reading.

At the end of the True Pacifist Run, we discover

the true identity of Flowey. Flowey is in reality Asriel Dreemurr.

But I am still not sure of something. This could just be a theory, or this is maybe a point in the game that I've missed. But my suspicion is that

Flowey's personality is split in two. Flowey could be Asriel Dreemurr and Chara.

I have always been asking myself this since I have finished the True Pacifist run, though the question emerged again today after I watched again the dialogue between

Frisk and Asriel after the seal is broken. One part of the dialogue says : "The control over our body was actually split between us. They were the one that picked up their own empty body. And then, when we got to the village... They were the one that wanted to... to use our full power. I was the one that resisted. And then, because of me, we... Well, that's why I ended up a flower."

That part was strange for me. In fact, we know that

Alphys was the one who injected Asriel's essence in the golden flower in which had been injected determination. But Asriel absorbed Chara's soul before going in the human world, so they kinda merged. Is that then possible that Chara was also transferred in the golden flower, and that both of them became Flowey ?

I would like your opinion on the question. Is there any information in the game which could confirm or invalidate this ?

(This question do not have for goal to debate on a theory, but to know if there is a concret element in the game which indicates if it can be certified or not).