Going one element grid has benefit using the likes of hanuman, managram, anubis etc even just as friend support'.
Fixed
Each same element eidolon with hime will give you 4% elemental attack if using hanuman and co as support. 4% elemental attack is big we compared strongest event eidos so far against strongest wind eidos so far which is obtainable through shop.
Example tiamat versus icarus. Tiamat attack 2262 vs icarus 2094. But icarus is wind if using wind hime icarus become 2303. So its become 2262 vs 2303 conclusion icarus attack is better than tiamat if using in wind team. We compare tiamat hp vs icarus hp. Tiamat hp 516 vs icarus hp 516. But icarus is wind so its become 568. In this case also icarus stats still better than tiamat the strongest event eidos in terms of status.