I actually want to talk about a specific scene where the show sets up Nettles introduction and the conflict she introduces.
In episode ten, when Daemon and Rhaenyra are arguing and they send everyone away to talk, the asoiaf prophecy comes up. This is the full conversation.
I think that's a big indication that the conflict would be if Nettles is introduced and the story follows closely to books. She would be viewed as a threat to Rhaenyra. Not because of jealousy but genuinely as a reminder of something her father said in that exact same conversation.
So the girl whose way of taming her dragon links back to the first dragon tamers in Old Valyria may rub Rhaenyra the wrong way.
The inverse would be Daemon and what he says, "Dreams didn't make us kings dragons did" so I don't think for a second he would question Nettles legitimacy even though she doesn't look that way. Her invoking the first dragon riders would read more like common intelligence to bond with a wild dragon, not an affront to Targaryen’s power of illusion.
I also want to note that this is a grieving Daemon, who Rhaenyra clearly isn't trusting at this point, and his reaction is to strangle her. To resort to violence to punctuate his point and anger. Unjustifiable. But a similar theme to what happens in Maidenpool. It's not an exact parallel, however.
This is where I say I think Vizzy T's line is utter bullshit and the series disproves it time and again. However, I can see Rhaenyra clinging to it when someone like Nettles claims a dragon. She wouldn't view her as a probable bastard from Driftmark with this understanding.
Without dragons, we are just like everyone else, what stops everyone else from claiming dragons.
What stops wild dragons from being tamed by locals?
I do think this belief is wrong, though. Targs did a lot of incest and blood magic to get where they are. I could never take that from them.
However, it is intentional for Nettles to be the dragonseed to claim a wild dragon, where visible bastards fail. I do think the show was spoonfeeding the audience paranoia and justifying the understanding behind Rhaenyra's dislike of Nettles.
This could also be where Jace and Nettles' relationship comes into play. He is very bothered by the fact that Rhaenyra won't say he's a Velayron in episode 6, but by episode 8, he seems to be helping his brothers understand that even if their parents are questioned no one can rake away the fact that they hatched dragons, are Rhaenyra’s sons and are the legal heirs to their seats and houses.
Do we see how he could bond with the only non Valyrian looking dragonseed who just proved to him at least that she is a dragonseed.
Do we see how he may be a tad defensive about her?
All this to say, I hope we get the prophecy talk between Nyra and her firstborn. Especially if it happens after she meets Nettles. He may have a different reaction, seeing as he has a different interpretation of the fact that a big part of his legitimacy was tied to a dragon hatching for him. This is also a post losing Luke Jace. He may be a bit more emotional than rational towards the idea because of it.
I know it's not an exact parallel, but Jace is 16 years old, and he is clearly set up to be an angry guy no matter how diplomatic he is. I can see him lashing out at the suggestion.
This is all to say, that I'm in HBO's walls waiting for my girl.