I don't find it contradictory at all. The con system simply takes into account the fact that a) soloers with above-average gear are capable of killing slightly more difficult solo mobs b) duos are not groups, and while they won't find solo mobs a challenge, they probably can't kill even-con heroics Mobs designated solo with one ^ are aimed at duos, and at soloers with above average gear. Personally I think it's great that the con system recognises the needs of duos, but if you wanna complain about that feel free!