OWINGS MILLS, Md. — Can a four-word tweet trigger the biggest trade in Baltimore Ravens history? On Jan. 29, offensive tackle Orlando Brown Jr. surprisingly posted on Twitter: “I’m a LEFT Tackle.” Two weeks later, there’s mounting speculation about what teams would want Brown and what the Ravens could land in return. The only certainty at this point is that it’s going to take a very high draft pick — a first-round one, at the very least -- to pry Brown out of Baltimore, which is something that has never happened in this franchise’s 26-year existence. In the 44 player trades made by the Ravens, none have involved a first-round pick and just two resulted in Baltimore getting a second-round one (offensive tackle Tony Jones in 1997 and tight end Hayden Hurst last offseason).