[OmikronWarrior]

Whats probably confusing things is the dominion bonus for prophets and pretenders. As dominion levels change (or the unit moves into a different territory), the bonus changes. However, "current HP" is not necessarily the same as base HP. I do not believe units can loose HP unless they are hit with some type of damage. However, at the end of a turn they're current HP will always heal up to at least their current base HP. Hence, it makes sense to rotate a Prtender in and out of enemy dominion back to where their dominion is strongest.

You can also see this effect with units with some type of HP drain.