I don't think that is correct. Can you give me an example of why you think it works this way?
Hit Points: The amount of damage a unit can take. If a unit has as many damage tokens as it has hit points, that unit is destroyed and is placed in its owner’s discard pile.
Q: What happens to any excess damage after a legend is destroyed?
A: Whenever a legend is attacked and destroyed, any excess damage will not be assigned to that zone or anywhere else. It is ignored, just like damage that is assigned to an already burning zone.
Why there is an excess damage when you attack legend? Shouldn't you be able to deal as much damage to it as you please?
"The amount of damage a unit can take" is just how much it can take before dying. The use of "take" there has no bearing on how much damage can be applied to it.
Yes, you can deal as much damage to the Legend as you please, but there can still be excess damage, since you only *have* to deal enough damage to destroy it. There is excess damage when you destroy a Legend the same way there is excess damage when you attack a zone and destroy the unit defending it. People thought maybe the excess damage on a Legend would "trample over" to the zone, the way it does when units are defending. That question tells you that you can't assign that extra damage anywhere else. I think the answer probably should have been worded slightly differently though, and not say to ignore the damage.
I see how that answer would have made you think it works differently, but the section of the rulebook I quoted is very clear that you can deal damage that exceeds the current HP of a unit or zone.
I'll put that Q/A on the list of things to bug Lukas about in the next FAQ though.