As I understand it:
Traveling through the 4th dimension: Any point in time on this timeline.
Traveling through the 5th dimension: Any possible outcome this timeline could take in the future.
Traveling through the 6th dimension: Any possible outcome at any given time. Could go directly from one point in time on this timeline to the same point in time in a different timeline.
I understand what you're saying and sort of agree, but "must have no idea about so much stuff" just sounds so childish.
Perhaps badly worded, but completely true.