EARTH CITY, Mo. -- The St. Louis Rams don't start organized team activities until June 2 but with most of the offseason heavy lifting complete, the roster you see now likely has the vast majority of players who will be on it come the start of the regular season.

With that in mind, we'll spend the next week or so delving into each position group with some thoughts on who will start, who might be on the bubble and how the depth chart could shake out.

Position: Defensive end

Returning: Chris Long, Robert Quinn, Eugene Sims, William Hayes, Ethan Westbrooks

Newcomers: Martin Ifedi, Matt Longacre

Departures: None

Projected starter(s): Quinn, Long

Battle to watch: There's very little drama to be found here as Quinn and Long are set in their spots with Hayes and Sims as one of the best backup duos in the league. That leaves a battle similar to what the Rams had in last year's camp although with far less profile for a fifth defensive end. In 2014, it was Ethan Westbrooks overcoming Michael Sam for the fifth end and ninth defensive lineman spot. This year, the battle figures to center on Westbrooks and Ifedi. Ifedi is a seventh-round pick but is coming off injury and the Rams are intrigued by his upside. But Westbrooks is also a player the Rams believe in and his versatility makes him especially enticing. Longacre can't be entirely overlooked, either, after a wildly productive college career.

Outlook: This is an interesting and big year for this group. Quinn is locked in through the 2019 season and remains the team's most proven elite player. Beyond Quinn, though, there are plenty of questions that need answering. Long would be the first to say he needs to have a strong bounce back year after an injury derailed his 2014 season. Even after coming back from that ailment, he was playing at about two-thirds of his usual speed. He's due to count more than $14 million against the cap in 2016 so ideally he could get back up to speed and earn an extension. Sims and Hayes add important depth because of their ability to line up anywhere on the line but both are also scheduled to become unrestricted free agents after the season. Westbrooks has similar versatility to Hayes and Sims and some believe Ifedi could offer the same. Much is expected from this group in 2015 and the more it provides, the better the chances it will have to remain together beyond this season.