The Seahawks are down to one final preseason game, which provides several players one last chance to show they deserve a role on this team or at least a spot on the 53-man roster or practice squad.The Seahawks are all about Marshawn Lynch, Earl Thomas, Russell Wilson, Richard Sherman, Bobby Wagner and the other veterans – young as they might be – who have helped this team reach unprecedented heights and expectations so quickly.But during this short week, as the team prepares for its preseason finale against the Oakland Raiders at CenturyLink Field on Thursday, the focus turns to Christine Michael, Ron Parker, Benson Mayowa, Sealver Siliga, John Lotulelei and the others who are battling to secure roles and/or the right to still be with the team after Saturday’s roster cut to 53 players.“We have a number of guys that are on the verge of really making decisions hard,” coach Pete Carroll said Monday, after the first of what will be only two practices to prepare for the Raiders and everything that game will mean to so many on the 75-man roster.“Those guys in particular, if we do it the way we plan to do it, we’re going to give them a really good chance to show it. We need to give guys the opportunity to show so we can make the decisions, and give them a chance to show for themselves. So the young guys will get a lot of playtime this week and they’re going to get a lot of looks.”Michael, this year’s second-round draft choice, is the NFL’s leading rusher during the preseason. But he’s also currently No. 3 on the Seahawks’ depth chart behind Lynch and incumbent backup Robert Turbin. So Michael needs to continue making every carry count, just as he did in rushing for 97 yards against the Green Bay Packers on Friday night and 89 yards in the opener against the San Diego Chargers.“Christine has been flashier in preseason, there’s no question,” Carroll said when asked to compare the rookie summers of Michael and Turbin, a fourth-round draft choice last year. “He has made a real flashy first impression. We’re excited about it. He doesn’t have the whole thing yet. He’s got a lot of work to do. He’s not always reading things properly.