Oakland let TE Jared Cook walk in free agency after he led the 2018 team in targets, receptions (tied), receiving yards and receiving TDs. It sounds like the primary replacement plan is former Raven Darren Waller. "It's your position, you are the 'Y' in certain personnel groupings," OC Greg Olson said Thursday, via NBC Sports Bay Area. "We're going to put you out there on the field, and you're going to play. We're really pushing him to the limit right now." Waller just joined the Raiders in November off Baltimore's practice squad. He made it into 4 games and caught 6 balls. Waller transitioned from WR to TE with the Ravens, and it looks like Oakland wants him to play ahead of Luke Willson, rookie Foster Moreau and others this season. Waller isn't likely to find anything near Cook's target share available in an offense that has since added Antonio Brown, Tyrell Williams, Ryan Grant and a 1st-round RB. But he has a shot at fantasy relevance.