User blog comment:Aithusa07/List of Plotholes from Merlin/@comment-10341849-20130718115816/@comment-80.194.173.91-20180131173942

Borden probably didn't do his research properly and maybe thought there was another easier way to hatch the egg, before Merlin came along, but then again he did react when Merlin told him he was the last dragonlord.

Aithusa was a baby dragon freely flying around without supervision when she found Morgana. Yes, Merlin hatched her, but had not fully told her in dragon talk to obey him. Without a dragonlord's bond, Aithusa probably just did what any roaming child would do. She finds a dying woman, she heals her, Morgana is probably the first person she's come across for a while and she's taken in by her looking after her. Her loyalty to Morgana after that is strictly a mother and child like bond, she's not tied to Morgana or HAS to obey her orders, she does them anyway. Only when Merlin tells her something she HAS to do it no matter what. She jsut has no reason to think of Merlin as an ally if she already is close to Morgana.

The thing about Arthur forgetting Mordred has magic is a bit conplicated. Arthur is years old at this point, he remembers that he saved a little boy just because he was a druid but has not actually seen a driud perform live magic. He perhaps knows Mordred is a driud but doesn't think driuds count, or that Mordred has left that life behind him, or cannot use physical powers.

Merlin is supposed to be the most powerful warlock but would only be so if he had been able to practice openly and get better for years. But at the point he jas to use aging back, he's not where he should be. He's powerful enough to hold an aging special coz he used potions. However the method back probably does take another potion if he is not used to it. Morgana later also uses aging magic but you can tell how powerful she is and how much more training she had by being able to do it via spells and psychological strength alone. She cannot hold it as strongly but can break it easily if she just lets go. Merlin has to do it the hard away. Until his last transformation out the the cave at the end, it is natural, and even though you don't see him go back to young merlin, you can tell it was easy for him to change back without a potion, as he is now in full control.

I feel bad that at the end, Merlin does not have much time with Arthur knowing he's a sorcerer. People have written so much fanfiction about Arthur and Merlin sitting down and fitting in a bit of explanation time. The specifics of the times Merlin saved Camelot, what he can do, about the dragon, about Freya, about having to be called an idiot when he was the genius. No, just got 'You lied to me, why are you still here, I know all the tings you've done', no you don't, you know nothing! Coz you won't let Merlin talk, and also oh coz you're dying :'(