Found an account that looked weird for it’s rank so I decided to look into it. This account went from diamond to immortal 3 in iron-silver lobbies. Only 5 stacks with 4 accounts that are iron-bronze. Great scores, high win rate, except when they were in plat playing vs plat diamond the average scores were much lower.

https://tracker.gg/valorant/profile/riot/Marlon0974%23420/matches?playlist=competitive