Possessions are different to disposals. A player gets a possession every time they have the ball in the hands. For example a player who gathers a loose ball, then gets tackled without disposing, will get awarded 1 possession and 0 disposals.
Major ball winner should line up with total possessions count (contested + uncontested)- not disposals.
FYI- Pendlebury has the disposals record. Does he actually have the possessions record yet😬