Highly doubtful. It was explained to me when Deluca got hurt but you can only apply for a medical redshirt if you lose 2 or more seasons due to "circumstances beyond your control". Since Marlette was voluntarily redshirted in 2014 (I believe) that doesn't count towards his 2 seasons. Plus I believe the threshold to consider it a full season lost is 30% of regular season games played or less and Marlette did play in 4 of 11 (36%) regular season games this year.
From Kolpack’s article today
“Klieman said he expects linebacker Matt Plank to return to the field this week. On the flipside, running back Ty Brooks is probably out with a hamstring injury suffered at Indiana State. Receiver Sean Engel missed last week with a leg injury, but is listed as the backup receiver on this week’s depth chart.”
Chris Board has a sprained MCL, week to week, same with Adam Cofield. They are not season ending injuries.
Plank did come back against YSU at least. I don't recall seeing him out there but he did play according to the participation report. http://stats.gobison.com/fb/2017/indgbg.htm
I am so pissed off with Dan Marlette's injury. I so wanted to see Cox and ND on the sides with DM in the middle