We're only discussing the storyline here, not how the factions and insignias came to be in toy terms. The Predacons have an insects' head and the Maximals have a wolves' head (kinda). But the problem is that they had these same insignias before they went to Earth to become beasts. So not knowing they would become beasts themselves, they have beasts heads for their insignias. So why do you think that is? The Predacons is easy - lets say that the Insecticons from G1 formed their own seperate faction and had what would later become the Predacon insignia as their own insignia. And the name Predacon would come from the G1 Predacons. And lets say that Decepticon politics over the years lead to the the Predacon team name and the Insecticon insignia merging together to form the new faction. The Maximals... I see the word Maximal and I think Maximus. I see the word Maximus and I think Fortress Maximus. So I'll say that the word Maximal was derived from Fortress Maximus. As for the insignia... I think it bears a loose resemblence to the Brazillian Optimus insignia http://www.toyarchive.com/Transformers/Brazilian/BrazilianOptimusLogoSmall.jpg So maybe this became prominent and altered over the years to become the insignia for the new faction.