Riot It is EZ to tell when an account has changed hands.
My Jungler was a Plat 2 last season. In my game he was G4 with 28% overall win rate.
He ran around the map as jungler with no pathing, would go in to top and mid lanes and CS WHILE the laner was there (no gank) Never looked for Jungle objectives. Didnt ward his jungle even tho the enemy jugler was invading all the time.
This account was eBayed or account share or paid boosted last season.
Riot its beyond stupid ez to identify this kind of account with automation and just delete it.