Yeah, I'm sure that's the problem. It's not as if there isn't guides or anything thing else out there that reccomend starting off with 1 team or anything of that nature. Clearly all players start the early and mid-game by slowly adding several different element SR weapons to every single grid, rather than having some sort of focus by farming raids for assault weapons for their main team to fill their main team grid faster.
That was sarcasm by the way. Just in case you didn't think that through either.
You seem to be confusing a mono grid build with a half mix of the rainbow and mono build methods.