After earlier getting deals done with three defensive players the Seahawks on Monday retained one of their key impending offensive free agents — tight end Will Dissly. Dissly agreed to a new three-year deal worth up to $24 million, according to NFL Media. An exact breakdown of the contract was not immediately available. Dissly confirmed the news via Twitter shortly after it was reported with a tweet stating: “SEA!!!!” The salary marks a whopping raise for Dissly, who had just finished his four-year rookie contract that paid him $3.1 million overall. At an average base salary of $8 million a ye…