We’re not sure why star running back Marshawn Lynch hasn’t been attending the Seahawks’ voluntary workouts this week. And we’re not sure whether it really matters.

But we are sure his absence is conspicuous.

Lynch reportedly hasn’t been with the team (so far) in phase two of Seattle’s off-season workout program. Now, this isn’t particularly unusual and it isn’t particularly worrisome; Lynch didn’t join last year until later, and he is already quite familiar with the Seahawks’ offensive scheme. Likewise, Seattle’s coaches are already familiar with Lynch.

But it’s gotten some football pundits wondering. Brock Huard and Danny O’Neil opined about Lynch on their 710 ESPN Seattle radio show Wednesday and Thursday. ESPN’s Mike Sando, who’s based in the Seattle area, also noted Lynch’s absence Thursday.

Meanwhile, we know Lynch has had an ongoing problem with back spasms, which caused him to miss workouts and all four preseason games last year. His back also made him questionable all last season, even though he rushed for a career-high 1,590 yards. And the issue kept him out of one regular-season game in 2011.

Moreover, the Seahawks selected two more running backs (Christine Michael of Texas A&M and Spencer Ware of LSU) in last week’s draft, and agreed to terms with a third (Oklahoma’s Dominique Whaley) as an undrafted rookie free agent. Now Seattle has six guys to draw from: Lynch, backup Robert Turbin, fullback Michael Robinson, Michael, Ware and Whaley.