Sure took us a while, but we've finally power-crept Summoned Skull.
Actually, Summoned Skull got power-crept a while back. Gladiator's Assault (GX era) with Frostosaurus.
Also got matched up in ATK with Cyber-Tech Alligator at a 5DS era Starter Deck. Then Wattaildragon during the Xyz/ZeXal era, and Trance the Magic Swordsman surpassed it sometime in the Arc V/Pendulum era. To add to it, if we talk about high ATK for cheap during the DM era, Terrorking Salmon and Giga Gagagigo + A Legendary Ocean where Level 4 monsters with 2600 and 2650 ATK respectively and used to be a deck back in the day. I feel like I'm forgetting another 2500 or 2600 ATK vanilla beater somewhere but I'm sure that'll come to me eventually.