Jaguars quarterback Chad Henne has had something of a roller coaster season. He lost the starting job to Blaine Gabbert following the second preseason game yet has played more than Gabbert because of injury. Henne will make his third start of the regular season Sunday at Denver. Gabbert who recently recovered from a thumb injury was knocked out of last week’s loss to St. Louis with a hamstring strain. “This year has been kind of weird” Henne said. “You never know if you’re going to be the starter or coming into the game. When I do come into the game [when Gabbert was injured in the Kansas City and St. Louis games] I don’t get any reps [in practice]. Obviously I don’t make any excuses but there’s definitely determining factors out there and I try to play my best at all costs.” Henne who started the Oakland and Seattle games couldn’t ask for a tougher assignment than he will Sunday in Denver but it’s still another opportunity for him. He will go against Peyton Manning for the first time in his career in a game in which the Jaguars are 271/2-point underdogs. Manning has 20 touchdown passes and just one interception this season. He puts pressure on opposing offenses to try to score every time because Manning is capable of doing that. The Broncos beat the Cowboys last week 51-48. “I really can’t worry about what he’s doing” Henne said. “It’s more worrying about what we’re doing offensively. We’re just worried about how to beat their defense rather than worry about their offense” So far this year Henne has outplayed Gabbert posting a 73.2 passer rating with two touchdowns and two interceptions. Gabbert’s rating is 36.0 with one touchdown pass and seven interceptions including one returned for a touchdown each of the past two weeks.