The Tampa Bay Buccaneers are not a team with a great track record of retaining their best players. Tampa Bay has lost Ring of Honor members, Hall of Famers, and other phenomenal players.
Individuals like Steve Young moved on despite being incredibly talented, and other players like Warren Sapp, who were playing at a Hall of Fame level, were allowed to walk away in free agency.
One of the biggest problems with the Buccaneers is that they have a notorious history of letting players walk, who then find massive success with their new team, as explicitly seen with Young.