The Dead of Erech only owed one battle. Book-Aragorn cares about honour, and he could not honourably drive them further.
Besides, if the Dead fight at the Pelennor, the battle is as superficial and traduced as it is in the films; the Rohirrim pointless, Imrahil is pointless, Eowyn and Merry are pointless...it gelds everything in sight.
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Among the friendly dead, being bad at games did not seem to matter
-Il Lupo Fenriso
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