In Karate the belt order is white, yellow, orange, green, blue, brown, black. I think this clearly states that Suzuki recognizes the black model as the top dog of the colors (like a black belt). There isn't a red belt. So it must represent a blood stained belt after being beaten by a black belt. Sorry.
Further more and this is coming from the Marines website...
http://www.marines.com/page....ct=true
<div class="iF-Passage"><div class="QUOTEHEAD">Quote:[/Quote]<div class="QUOTE clearfix"><span class="quoteBegin"> </span>
The Marines use a system of colored belts to mark progress in the Marine Corps Martial Arts Program (MCMAP). Marines earn a new color when judged ready to advance to the next level.
Belt colors range from tan, gray, green and brown, to six degree's of black, with
black being the most desirable. Marines wear there belt on a daily basis with the Marine Combat Utility Uniform. It is yet another symbol of pride.[/quote]