Right. Well the thing about characters, especially the ones prior to the plastic sets, is that the normal WYSIWYG generally does not apply to the variance between a hand weapon and a great weapon on a character. Although it is encouraged to have an appropriate fit, one does not really have to worry too much. Obviously, you dont have to worry about the jaguar totem too much, although the scar veteren model does have a nifty chest guard that depicts a stylized jaguar's face.
The concern more is that you can distinguish the hero model easily from the R & F. Yes, you can certainly make a scar veteren out of any Saurus model, but IMO it just isnt quite the same. If you are really gung-ho about the great-weapon depiction, I would suggest simply doublue stacking a club (on either model you choose). Another great method is to use a spear from the Saurus sprue to make it appear longer. Although it might appear at first glance to be a halberd, placing the blocky saurus club bit on top should give you the needed impression.