The board has rebuilt on the September patch
127 balance changes landed across 40 brawlers. A week later every draft behind the tierlists is a post-patch draft, the pre-patch games now count for nothing, and the board looks different because of it.
Supercell shipped 127 balance changes across 40 brawlers at the start of September. A patch that size does not adjust the meta, it replaces it, and a tierlist built on drafts from the week before is describing a game that no longer exists.
BrawlPilot handles this by anchoring its data to the patch rather than to a rolling window of days. Drafts from before a patch fade out over the days after it lands and are then dropped entirely. As of today that fade has finished: every one of the 3,853 drafts behind the current tierlists happened after the patch, and the pre-patch games now carry no weight at all.
So the board you are reading is not the old meta with new games mixed in. It is the new one.
What the drafts say now
Gus is the most drafted brawler on the overall board, appearing in 38.3% of tracked drafts and winning 53.3% of the 1,510 he was in, across 1,096 different teams. That is a pick rate no one else is close to.
Shade has the highest win rate, at 62.4% across 779 drafts. He was reworked in this patch and has been winning more than anyone else since.
Amber at 59.0% and Wendy at 55.8% are the two clearest cases of a buff that actually landed. Wendy also picked up a new hypercharge in this patch. Plenty of brawlers were buffed on paper; these are the ones where the drafts agree.
One caution worth stating plainly, because it applies to every number above and to anything you read anywhere else. A brawler can post a flattering win rate on too few drafts to mean anything. The tierlists page shows the draft count next to every row for exactly that reason, and a figure without one underneath it is not evidence.
Where these come from
Tracked pro team scrims alongside high rank Ranked drafts, with the scrims weighted three times heavier than a Ranked draft. Nobody curates the list, nothing in it is anyone's opinion, and it refreshes around the clock rather than waiting for a person to notice something has moved.
A map earns its own tierlist once enough drafts have landed on it, and reads its mode's list until then. Pro teams scrim a narrow pool of maps, so that coverage is genuinely uneven and the site says which pool a set of tiers came from instead of hiding the difference.
Nothing to do on your side
This is not a release, and there is nothing to update. The rebuild happened on its own as the drafts came in, which is the point of measuring the meta rather than writing it down.