Actually, yes. Excadrill can check almost all the rock setters in the game: it OHKOes Tyranitar and resists Stone Edge, 2HKOes Ferro with a bit of prior damage (and resists Gyro Ball), smashes Clefable to pieces, OHKOes Heatran, Scarf variants kill Terrakion. Latias can't really, but with her amazing special bulk it can Defog against pretty much everything that doesn't have a STAB super effective attack.
Starmie loses to Tyranitar, Ferrothorn, Clefable and Focus Sash Garchomp / Terrakion (although it leaves them at 1%).
You are way overselling Excadril lol
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 252+ Def Ferrothorn: 109-130 (30.9 - 36.9%) -- guaranteed 4HKO after Leftovers recovery
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 252+ Def Ferrothorn: 109-130 (30.9 - 36.9%) -- guaranteed 3HKO after Stealth Rock, 3 layers of Spikes, and Leftovers recovery
2HKO with a bit of prior damage? LOL. And it can just Leech Seed/Power Whip for fun. Not saying that Starmie wins, but Excadril doesn't.
252+ Atk Mold Breaker Excadrill Earthquake vs. 248 HP / 252 Def (standard support variant that actually carries SR) Tyranitar: 272-324 (67.4 - 80.3%) -- guaranteed 2HKO
0+ Atk Tyranitar Earthquake vs. 4 HP / 0 Def Excadrill: 306-362 (84.5 - 100%) -- 18.8% chance to OHKO after Stealth Rock
252 SpA Life Orb Starmie Hydro Pump vs. 248 HP / 8 SpD Tyranitar in Sand: 260-307 (64.5 - 76.1%) -- guaranteed 2HKO
Excadril is only barely better than Starmie against support TTar
LOL since when does Clefable carry SR? and even so:
252 SpA Life Orb Starmie Hydro Pump vs. 252 HP / 0 SpD Clefable: 212-251 (53.8 - 63.7%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Mold Breaker Excadrill Iron Head vs. 252 HP / 252+ Def Clefable: 260-308 (65.9 - 78.1%) -- guaranteed 2HKO after Leftovers recovery
Nope Excadril doesn't do significantly better
And I like how you said Scarf Excadril kills Terrakion yet against Starmie it survives with Focus Sash. The double standard is strong with this one.
No it doesn't, but by that logic anything that gets a random support move is better than another Pokemon which does its job better, save for that move. Starmie is outclassed in this regard.
By that logic Latias is outclassed by Latios save for Healing Wish. (Hint: No it isn't). Besides, Starmie's job is a spinner that can clean up if needed; Greninja's job is a cleaner that cannot spin if needed. It's not even the same job, so they are barely comparable. And Latias/Latios doesn't outclass either Starmie, since neither of them has the power to actually stay in to clean up because of the nature of Draco Meteor.