No, I don't really see that. I can't say that anything in this game was balanced for huge parties. If you read my post I explicitly say that even the most dangerous fights you can engage in and still benefit from scaling SP rewards are trivial in a duo. I'm talking 20-25s kills, for two people. If they had really balanced for 15 people then getting the max SP would have been practically impossible for a duo. If anything it seems like the game is currently most balanced for solo play, where the con values actually line up with increases in SP rewarded. Whereas even in a bare-bones two person party any green con or above you see is automatically going to be above the point at which SP will scale with difficulty.