Geno Smith. Ryan Fitzpatrick. Matt Barkley

They have jobs. Colin Kaepernick doesn't. And it's not sitting right with Brandon Marshall

The Denver Broncos linebacker has been a staunch ally and friend of Colin's for years -- since they played together at Nevada back in college, where they were also fraternity brothers. 

Marshall -- who famously joined Kap's national anthem protest last season -- says Colin is still immensely talented and driven and BELONGS in the league. 

He also tells us Colin's smart, talented, hard-working -- he's not a menace and won't do anything to cause an NFL organization any issues if he's signed this year. 

Marshall also has strong feelings about Mike Vick's haircut comments -- saying, "Those words should never have come out of his mouth from a black man to another black man."