Antoan Richardson possesses speed, which, as they say, never goes into a slump. When the former Mississippi Braves outfielder is getting on base, he can be a force, which he has been at Triple-A Rochester in the Minnesota system. The 5-foot-8 Richardson, a Bahamas native who played at Vanderbilt, is batting .301 and has 15 stolen bases in 31 games at Rochester. He was promoted from Double-A New Britain after batting .336 with 14 steals in 33 games. Given a shot, Richardson might be able to help the Twins, who just can’t seem to get going. Richardson spent parts of two years with the M-Braves, batting .279 with 24 steals in 2010 and .283 with 17 bags in 2011, the year he got a brief stint in Atlanta. He was in the Baltimore system last season. … Matt Wright, who was in the rotation of the first M-Braves club in 2005, is 8-0 with a 2.74 ERA for the Sugar Land (Texas) Skeeters in the Atlantic League. Also with the Skeeters is former Jackson Generals ace and onetime big leaguer Scott Elarton (4-5, 4.75).