How much is due to a contract advisor if they negotiated part of a player’s salary before the player switched agents?

In the context of NFL agent contracts, a contract advisor is typically entitled to a percentage of the salary they negotiated before the player switched agents. When a player changes agents, the previous agent is generally only compensated for the work they completed while they were representing the player. In this scenario, since the previous agent negotiated part of the player's salary, they would receive their agreed-upon percentage of that originally negotiated salary, which is often around 3%.

This approach acknowledges the efforts and work put in by the original agent in securing certain aspects of the player's contract, while also allowing the player to take advantage of a new agency arrangement without incurring additional fees on the entirety of a new contract negotiated by the new agent.

The other options, while seemingly relevant, do not accurately reflect the typical contractual practices in the NFL regarding agent compensation on previously negotiated salaries.