How is that "incredible manliness" though? It's more along the lines of, "gotta do this to win and save the universe".
If Gar is defined as out of the ordinary manliness, the kind that transcends beyond what one would expect of a man, Viral hasn't really done much in that respect. His most manly moments were disobeying orders to kill Nia or a defenseless Simon in the first arc.
As Gurren's pilot, even Gainax admitted Viral was rather useless. His primary duty was to adjust Gurren's power gauge.