If someone got some strong picks in one element (water here), then this whole discussion doesn't even make sense, talking about f2p and what not, when you have better team than some paying players. That's when you actually pull some ridiculous things like that though, I think more often than not it's not the case and by maining one thing you're doing yourself disfavour.
This, for all points basically this. I agree, MLB Behemoth is a big stretch, but including some 0 LB Kamihime weapons in the 'so called' f2p grid is not something I would nitpick on. But yeah, seems 3 of my weapons' grids are not f2p.