3 surprising breakout candidates for the Oakland Raiders in 2019

Darren Waller
After letting Jared Cook walk in free agency, the thought was that the Raiders would use some of their high draft capital on replacing him. However, they choose to not address tight end until day 3 taking Foster Moreau in the 4th round. So all signs are pointing towards Darren Waller getting his chance to prove himself as a starter.
The Raiders brought on Waller from the Baltimore Ravens practice squad, and despite six catches for 75 yards in four games, the coaching staff seems very intrigued by Waller.
Jon Gruden, in particular, spoke very highly of him during minicamp last month.
"“Since the time he’s walked in here, he’s been one of the most impressive guys on our team,” Gruden said. “He learns fast. He is fast. He’s extremely talented.”"
Waller has big shoes to fill as Cook was one of the best tight ends in football last season, but given the hard work he’s shown on and off the field we have no reason to doubt his ability to put in the necessary work.
He likely won’t get the volume Cook did with the additions at receivers, but Waller just being a capable starter will be a big win for the Raiders.