Butler: A's offense can be 'dangerous'

Butler's solo homer 0:43 6/29/15: Billy Butler hammers a solo home run to straightaway center field, his sixth of the season, giving the A's a 5-0 leadButler's RBI double 6/29/15: Billy Butler smokes a double down the third-base line, driving in Josh Reddick from first base to pad the A's leadMelvin on Graveman, Butler 6/29/15: A's manager Bob Melvin discusses Kendall Graveman and Billy Butler's performances in the A's 7-1 win over the RockiesA's teammates believe Morales did not throw at slugger on purpose

OAKLAND -- The echoing sentiment among the A's before their series-opening game against the Royals at the Coliseum on Friday is that the team wants to put the drama-filled April meeting…