The Times-Union’s countdown to Jaguars training camp begins today with a beat writer’s roundtable.

Five questions – about new coach Doug Marrone, players with the most to prove, injury concerns, under-the-radar candidates and overall state of the team – were presented to Ryan O’Halloran and John Reid.

The newbie (Reid) gets the first crack at each question and repeat answers by O’Halloran are not allowed.

1. What is coach Doug Marrone’s greatest challenge during training camp?

John Reid: Getting continuity established on the offensive line. I thought too much experimentation went on in the off-season, like having Brandon Linder take snaps at right guard although he performed well at center last season. With training camp approaching, it’s not good Marrone still can’t identify his five best linemen. A big problem was not addressing the interior offensive line needs. If they are going to be a run-oriented team, it has to start with the offensive line. If Branden Albert is going to be the starting left tackle, second-round pick Cam Robinson should be immediately moved to guard.

Ryan O’Halloran: Making sure quarterback Blake Bortles is of sound mind and mechanics when the Jaguars’ charter departs for Houston on Saturday, Sept. 9. Making sure Bortles establishes a mechanical foundation and has a comfort level with Nathaniel Hackett’s offense should be Marrone’s main focus this summer. If that means Bortles takes more practice snaps, so be it.

2. Which players have the most to prove in training camp?

JR: Without question, Bortles is entering a make or break season. He regressed significantly in 2016 after setting the single-season franchise records in passing yards (4,428) and touchdown passes (35) in 2015. A big problem last season was his 22 turnovers, which included 16 interceptions. The Jaguars picked up Bortles’ fifth-year option, but if he

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