Electivire is faster and stronger than Lucario. Heracross can't boast that \o/
And seriously does it need said in every damn statistics thread that there is not a definitive cutoff point between UU and OU? On top of that, it averages in the past few months, it is not dependant on this month alone. Heracross has been low in usage for a long time, it would be no surprise if he managed to avoid it this cycle.
Electivire's 252 Adamant CB Thunderpunch vs max/max Impish Forry: (31.36% - 37.29%)
Heracross's 252 Adamant CB Close Combat vs max/max Impish Forry: (50.28% - 59.60%)
Lucario's 252 Adamant CB Close Combat vs max/max Impish Forry: (46.05% - 54.52%)
Using maximum attack and the most powerful attack at their disposal (and using it on a neutral target), Electivire is the weakest of the 3 by far. If it really were both faster and stronger, it would be higher than Lucario in usage.
On that note, lol UU Hera. It will destroy the tier for a bit before getting the boot, I think.