In the three seasons since the Raiders made him their third round pick in the 2011 supplemental draft, he has appeared in 15 games, starting 10. He was 3-7 over those ten starts completing 56.3% of his passes for 1953 yards and 9 touchdowns to 12 interceptions for a 69.3 passer rating. He added 93 rushes for 627 yards and 3 touchdowns.
Pryor wanted to go somewhere he had a chance to start and this is just about the last place he would get that opportunity. On the other hand, he would join the Super Bowl Champions so he would have a chance to get a ring as a back-up, then be a free agent after next season.
The Seahawks were not the only team to inquire about Pryor's services. According to PFT, the 49ers were also looking into acquiring him. With the Seahawks offering the lowest tradeable pick, this means the 49ers must have been offering a conditional pick.
Per multiple sources, the Seahawks and the 49ers were both pursuing a trade for Terrelle Pryor. Seattle won.— ProFootballTalk (@ProFootballTalk) April 22, 2014
More details as they come out.