BY JOHN BRANDENBURG, Special CorrespondentThe three witches played a much bigger part, nearly stealing the show from expanded battle scenes and the fine performances of the two principals, in the staging of “Macbeth” at Myriad Gardens Water Stage, 301 W Reno. Cast as the “weird sisters” in Oklahoma Shakespeare in the Park’s “Macbeth” were Allison Chrzanowski, Lauran Dewey and Michelle Roselle, led in one scene by a masked Eva M.