No, Brock Bowers doesn’t exactly know what a “football robot from heaven” is either.Klint Kubiak used those four words to describe the Las Vegas Raiders’ star tight end during the first week of OTAs. Bowers said the comment took him by surprise, but he’s happy his new head coach is excited about his prospects.“I guess it’s a compliment,” Bowers said. “(My teammates) thought it was funny too. They were all poking fun at me and stuff, so it was good.”The characterization was definitely an endorsement of Bowers — Kubiak also called him a “Cadillac,” as in Bowers is a high-powered machine that will make his offense go. But in his second season, the All-Pro pass catcher couldn’t get his wheels turning how he’d like after an injury to his left knee in the season opener.Bowers had success after a three-game absence. His 64 catches for 680 yards and seven touchdowns earned him a second Pro Bowl selection. But the output paled in comparison to a stellar rookie season during which his 1,194 yards led all tight ends. Bowers said his production was hampered by the injury throughout the year.“Last year was frustrating,” Bowers said. “First game, kind of banged my knee a little bit, so definitely wasn’t how I planned my second year to go. A little adversity, and I’ve just got to come back stronger this year.”Bowers is prepared for his comeback, as he said he feels “100 percent” healthy and “ready to roll” for the year ahead. He’s practiced at full speed during the team’s offseason program and OTAs and said becoming more durable has been a focus of his offseason.“I’ve been trying to do a lot more preventative work, trying to stay healthy throughout the offseason,” Bowers said. “Going into camp especially, and going into the season. That’s half the battle, staying healthy and staying available week to week.”