In real life elephants move faster than a human on two legs. So how much stronger would battle elephants/ war elephants be if they were slightly faster than eagle warriors?
do you not remember khmer battle elephants?
If going for realistic approach they should get the charging ability too.
Try it by yourself in the editor. You can change units’ speed by triggers.
They would be able to avoid pikes, and they could escape some monk conversions.
So they would be OP
Well, khmer elephants where op not only for the speed, but for the crazy eco + the extra attack