I understand that Possession as a season does have it's fair share of problems but I do think that as a character Morro is a better Tai Lung.(then the original was).

Lets first give narrative points for the original.He not only sets the story in motion and is the character who had the most impact on Shifu until Po came around to change him.As well as show the themes of destiny/fate and ones own worth.His fight with Shifu and Po are his greatest scenes for many reasons I listed as before as well. But I think Morro does show what Tai Lung wanted to potray more. The diffrence here is that Morro died and is a ghost. Morro's backstory is more exposition heavy...