I am having trouble understanding possessions in basketball as it seems like there are 3 equations. One that is (FGA+0.44*FTA+TO) and another that accounts for Offensive Rebounds found here. Lastly, the main one created by Dean Oliver found here. Are the first two estimates of possession, as in a much simply way to calculate possession?
My question stems from looking at some formulas like TOV% and Points per Possession. Seems like TOV uses the equation found above and PpP uses Oliver's equation. Why does this difference exist? Also are players TOV%/PpP different than a team's TOV%/PpP? I feel like the calculation should be the same, but using the teams numbers instead of a players.