(Spoilers Main) "You will never walk again but you will fly" is not about warging a raven or a dragon

When Bran finally reached Bloodraven, he was told "You will never walk again but you will fly"

A lot of people have theorized that this statement means that eventually, Bran will skinchange a dragon and be the third head, next to Daenerys and Jon.

However, I don't think this is the case. Bran slipped into Hodor's mind in multiple instances and walked using his body. Despite this, he was told "you will never walk again". If slipping into the mind of a man to walk doesn't count as him ever walking again, I don't think slipping into the mind of a raven or a dragon will count as flying.