here is the part that doesn't make any sense. If Cersie is conspiring with Tyrion, why would she want him killed? Certainly not yet? Or is Qyburn acting on his own? Also, why wouldn't Bran be aware of any plot the two had against them? Or has this conspiracy not happened yet? I find it really interesting that Tyrion had a big interest in Bran.
It's odd though, although the leaks do suggest this. Tyrion never liked Cersei, never trusted her. The one Lannister he does like is now fighting for team Dany, so it just doesn't make sense. Unless trying to get Cersei safe passage is looked on as treason.
I think you right, but remember, while the GC is compromised of Targ Bastards and their offspring, they were exiled during the blackfyre rebellion. This means it was a full blooded Targ that exiled them in the first place.