Jackson has played in just two playoff games since. The important message that Jackson is helping deliver in the locker room is that it's great to win the division title in Chip Kelly's first year as head coach, but that's far from the ultimate goal.
"We just continue to let guys know it's alright to be division champs, but we're not satisfied with it," Jackson said. "Throughout the season, this is what we prepared for. Once you're here, there's no mistakes possible. That's essentially what we have to do. Just knowing the game comes down to bonus plays and bonus penalties.
"It's for the team. Everybody's put so much hard work into this and one little thing can easily end it all for us and send us home."
After that first season, Jackson wasn't sure how tough it would be to make it back again.
"You never know. It's the NFL. There are great teams out there every year. It's a really competitive league," he said. "I know what that taste in my mouth feels like from being so close my first year. I'm going to do everything I can to help my team get back there."