Micron Technology Corp president and chief operating officer Juan Benitez and its chief financial officer Leslie Gill both resigned yesterday for personal reasons, throwing observers into a tiswas as they asked why the pair should quit simultaneously, with no new jobs to go to and no plans to retire, just at a time when the Boise, Idaho company is doing so well on the back of the memory chip shortage: Micron immediately filled the two posts from within its ranks, and no-one has suggested any firm explanations for why the pair should quit together, but when you learn that, despite the spelling of the first name, Leslie Gill is actually a Ms, one possibility nowhere canvassed seems fairly obvious…