I think you may be stretching your numbers in order to make your case " Now losing 9 of 11 defensive starters along with the entire offensive line plus a handful of receivers, 5-5 is a real possibility."
With you being the superfan, surprised you didn't know that the Entire season, Maryville started on offensive line, a sophmore at Left Tackle and a Junior at Right Tackle.
Also, you say "now losing 9 of 11 on defense" - try 10, only 1 Junior started (at Defensive back), the rest were seniors. But interesting fact, of the 10 senior starters on defense, 6 of them were 1st time starters (4 returning starters on Def). So Rebels will have 10 new starters on defense vs 6 this past year. Don't think that quite justifies a 5-5 season.