Yep i feel Jon will take Jaime's role and Dan be like Cersei in ruling..I dont mean their wickedness but about the stature..
I too started re-watching since last week completed two seasons re enjoying the thrills. This time watching in High Definition Video.
I can't forget the first time , " Rains of Castemere " occurs full length at the end of season 2 episode 9 when Tywin along with Loras Tyrell save King's landing from Stannis. Cersei is about to poison young Tommen. Brilliant!!!
Among Lannisters, Tyrion has amazing knowledge. Though his character starts with some negative shades at the end of the season he becomes positive.
He is the only Lannister who thinks for others too... But Tywin , Cersei and Jaime are excellent characters