Player more valuable, per season, before signing long term deal than during it.
Player more valuable, per season, over the life of their long term deal
Modern 5 year deal = all deals identified from research which were commenced and completed from 2012 to 2021.
'Mega' contract = any identified contract 6 years and up in AFL era including recent deals.
Christian Petracca placed at average of 2020 and 2021 output.

Player Approximate Value (PAV) is a system which quantifies an individual's attacking, defensive and midfield contributions to their team.