The legend tools in Revit are...let's say (to be polite), wanting. I don't use them. I draw all legends in a future phase which works wonderfully well except a legend drawn in plan view is only allowed on one sheet. I've gotten around this by creating many dependent views of each legend.
What Revit really needs is a "legend space". A completely separate 3D workspace with it's own views that share the following with the "model space":
-View templates
-Families
-phases
-groups
The only difference in the views in legend space can be place on many sheets, not just one.
James