Actually, with the exception of Sivir. Ashe does the single highest level 1 damage of all the AD carries in the game.
Interesting fact.
It tapers off later.
If you're going off the ROG post, apparently the guy made some mistakes in his calculations. I've been interested in the L1 burst, though, because I feel like Ashe should have less. So I've decided to do it myself! Calculations are done with no bonus AD and ignore armor.
Doing the math myself, Sivir does 60+48+49 damage at level one, with a single autoattack and both hits of boomerang blade. Meaning 157 damage total. Ashe does 46.3 damage off the autoattack, 46.3 more damage with the crit, and 40 damage from volley. Meaning 132.6 damage total.
Ashe does less base damage here, though her combo is definitely more consistent. You deal 24.4 more damage as Sivir if you get both hits from Boomerang Blade, but you do 23.6 less damage if you can't get the second hit off.
But of course, there's one more thing to take into account: Scaling. With Sivir's combo, you get 1.1 scaling on the first hit of Boomerang, .88 off the second, and 1.0 off the autoattack. Meaning every additional 1 AD you buy nets you 2.98 extra damage. With Ashe's combo, you get 1.0 off the autoattack, 1.0 more off the crit, and 1.0 off the volley. You're getting 3.00 more damage as Ashe for every AD.
So their scaling is basically identical, yes? Wrong! Ashe has one thing to her advantage: the 10% extra critical damage mastery. This bumps her volley-crit combo up to a 3.1 AD scaling. How much of a difference should this make? Not much,actually . You'd need 244 damage to even out with Sivir's optimal combo.
So yeah, Sivir gets more damage optimally but Ashe has more consistent damage.
edit: This patch will lower Sivir's boomerang blade damage by 10+8, making her basically unconditionally worse than Ashe at level 1. You'll get like 7 damage out of getting both hits on Boomerang Blade over Ashe's (far easier to land) crit+volley.
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In other news, I totally just remembered how fun jungle Yi is. Just make sure your laners have CC since you bring about as much as Shyvana. Actually, with Alpha Strike, I could see Yi performing a Shyvana-esque fast counterjungling role. His passive helps too (not very much tbh), giving you another wriggles chance every once in a while.
Yi really shines in midgame, I've discovered. Most games have ended before I've had a chance to finish my patented BVeil-Atma's-Youmuu's-InfinityEdge build. Someone like Yi can actually use the crit from Atma's, making it more efficient at a lower amount of health so you don't need Warmog's.