He's a bad boy Velociraptor trainer who is only crucial to the story because he is played by Chris Pratt. Make no mistake, if it was anyone but Pratt, America's Cool Older Brother, the executives at Universal would've probably had his character be disemboweled in Act 2. By the logic that these films operate on, his basic character type -- glib, arrogant, macho -- is that of a villain. They didn't even give the character any kind of an expert background. ("What, and make him some kind of nerd?") They just say he was in the Navy before he trained raptors. That's it. Not "He was in the Navy and trained a deadly squadron of throat-slitting commando dolphins." He's just been on a boat before.
What's worse, all of his one-dimensional swashbuckling and wisecracking detracts from the arc of the female lead, Bryce Dallas Howard's Claire. Unlike Pratt, she plays a character with actual growth, going from a heartless executive to practically starting her own dinosaur PETA within 24 hours. The Big Bad of the series has always been greedy unethical corporate executives, so why not center the movie on the development of one who learns the error of her ways?
"Yeah, that's great, kid," says a studio exec, chomping on a cigar. "Listen: How about instead, and stay with me here, the Dinosaur Whisperer starts a dinosaur motorcycle gang? Your thing may be good storytelling, but mine will look badass on the poster. Which means I win."