Shohei Ohtani’s arrival in Major League Baseball this winter was met with so much hype, anticipation and historic recalibration — he is seeking to become the first full-time, two-way player since Babe Ruth 100 years ago — that we may have forgotten, if only briefly, the difficulties facing him in that pursuit. There is a reason no one, not even great two-way prospects such as Dave Winfield and Josh Hamilton, had seriously attempted, let alone pulled off, this double play: Baseball is too specialized, with hitters and pitchers on separate, detailed, daily programs, to allow for someone to do both. But Ohtani has other factors working against him, namely his move from Japan’s Pacific League to MLB, with its jump in talent-level and international scrutiny.