JACKSONVILLE -- Senior writer John Oehser's five takeaways from Day Five of Jaguars 2015 Training Camp Wednesday at the Florida Blue Health and Wellness Practice Fields …

1)Far too familiar.We begin Training Camp Day Five takeaways on a topic that is now familiar – an injury to wide receiver Marqise Lee. The second-round selection in the 2014 NFL Draft sustained a hamstring injury in practice Wednesday. Jaguars Head Coach Gus Bradley didn't know the extent of the injury immediately after practice and though Lee was being evaluated, Bradley said he doubted Lee would practice Thursday. This came a day after Jaguars General Manager David Caldwell said during a conversation with local writers he wasn't ready to label Lee as injury prone. The reality is one tweaked hamstring in early August doesn't make Lee injury prone, nor does it mean Lee won't produce this season. But Lee's injuries were a topic with Caldwell Tuesday for a reason. He missed three games with a hamstring injury as a rookie and missed the offseason program with a knee issue this past offseason. He also missed time in his rookie offseason with a hamstring injury. There were no signs early in camp of Lee's offseason absence having set him back; in fact, he looked very good. But until he doesn't have these issues, injuries are going to be a topic with Lee – and increasingly, a concern.

2)No timetable.How soon will the Jaguars know their starting center? Bradley said Wednesday he doesn't have an exact date, but he also said he doesn't want the issue to linger. Ideally, Bradley said he would like to decide a starter between Stefen Wisniewski and Luke Bowanko by the third preseason game. Wisniewski signed as a free agent in the offseason after starting his first four NFL seasons in Oakland and Bowanko started 14 games as a rookie for the Jaguars last season. The two have rotated working with the starters daily so far in practice, and Wisniewski worked with the starters on Wednesday. "We'd like to have that to where it plays out, but I think it's more important that it be the right decision," Bradley said. "We want to make sure we can give it some due process. … I am not going to make a decision in a week and a half and it's not fair to competition. We've got to get the right guy."

3)And on the left side … Bradley also commented on the left guard situation Wednesday. Though sixth-year veteran Zane Beadles is working with the starters, the Jaguars selected A.J. Cann in the third round of the 2015 NFL Draft from South Carolina and many observers believe Cann can push Beadles for the starting job. "Cann, we like the qualities he has and what he shows," Bradley said, adding that experience obviously is an issue in Beadles' favor. "Zane has that and I think Zane has picked his level of play up from where he was. It's good competition that's going on there – really across the board."

4)No. 5 will be a tough get.To talk about the No. 5 receiver battle is to scale pretty far down the depth chart – particularly less than a week into training camp. But with Lee out for what seems at least a short time, now's a good time to address the No. 5 receiver spot. The Jaguars' top four receiver positions likely will be second-year veterans Allen Robinson, Allen Hurns and Lee and rookie Rashad Greene. If you assume the Jaguars will keep five receivers, then that leaves a slew of players including Tony Washington, Arrelious Benn and Tandon Doss competing for the fifth spot. Special teams will be a key, with Benn capable of being a "four-core" special teams player and Doss having led the NFL in punt returns with Baltimore in 2013. All three players have made plays offensively early in camp, indicating a deeper wide receiver position than past seasons – and a legitimate training camp competition. Still, the leader at least early appears to be Benn. The 2010 second-round selection by the Tampa Bay Buccaneers has made plays early in camp and worked with the first team when Lee left practice Wednesday.

5)Keep an eye on … Davon House.The veteran cornerback was signed to further strengthen an increasingly solid position – and early indications are he has done just that. While second-year veteran Aaron Colvin's play inside and outside early in camp has received a lot of attention, don't overlook House. The unrestricted free agent from Green Bay has shown up early in practice, often covering the Jaguars' top receivers. He has several pass breakups and appears to fit the bill of a long defender who can play press coverage in Bradley's defense.