[2021] Out of the two most recently released agents: Skye has the lowest playrate and Yoru has the lowest winrate in ranked

That's not how her heal works, actually - 25 "points" of her heal heals everyone in the radius for 25. So 25 points of her heal is theoretically worth 100 points of healing, if you heal 4 teammates at once for 25. Skye could theoretically heal 400 with one charge of her heal if all her teammates managed to take 100 damage to their health over the course of the round without dying.

Does your team control for pickrate? I'm primarily asking because it looks like you have Killjoy as the highest winrate agent, but we stopped using direct winrate internally awhile back because we have mirror matches in our game, which means that the higher an agents' pickrate, the more their winrate converges to 50% (because they play against each other more often, slowly converging them to 50%).

This is probably why you have Killjoy as the strongest agent for so long, because she has a decent winrate but more niche playrate than other agents, making her flat-out winrate (including mirror matches) higher. We've used non-mirror match winrate for awhile now and our data ecosystem looks quite different in terms of power because of this! Sage is incredibly strong rn, but her pickrate is so high that her winrate in these visualizations is being compressed down to 50%.

Correct. Because any game that has Sage on both sides will just give us a winrate of 50% when one Sage loses and the other Sage wins. We do still look at round-level winrates on attack and defense to see how an agent’s power is manifesting across a match, and you can use mirror match data in those sort of analyses and compare situations in mirror matches or non-mirror matches, but for match winrate we don’t use mirror matched games.