It sure seems that way, what with every side story revealing a new Gundam variant that was so secret that nobody ever heard of it ever again. But, if I may direct your attention to Solomon and A Baoa Qu, with shot after shot of entire waves of GMs and Balls getting urfed/'sploded/melted... I'm gonna have to give the sheer count award to the trusty GM.*

*At least until the next Gundam light novel series, My Life as a Rock: I Was a Normal High Schooler Until I Got Sucked Into the Universal Century After Getting Hit By a Runaway Uber and Ended Up as an Asteroid That Was Really a Dimensional Portal That Held an Entire MS Development Lab and it Turns Out That All of My Lacrosse Teammates That Had Mysteriously Died in the Past Year Were Also Nearby Asteroids With Dimensional Portals so We Literally Had Gundams Coming Out of Our Butts