If we take the original RQ-era Pavis/Big Rubble at face value, one of the
Argraths is none other than Garrath Sharpsword. He helps preserve the
Cradle against the Lunars, then sails off with it to the Underworld. Meets
up with Harrek somewhere along the way. Whether he is also Whitebull is
anyone's guess, but I think not. I'm pretty certain it's Whitebull who is
with Kallyr when she lights the Flame Of Sartar (and later they argue). I
would say "the" Argrath is anyone you want it to be. Do you want yours to
be a "historical" game? Then many Argraths is the likely path. Do you want
a legendary game? Then have only one. Like King Arthur, there is room for
interpretation.
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