I’m not so sure that’s how any of it played out. For example, last September was the first time Iglesias and Bogaerts played together in Boston. Iglesias was dealt to Detroit 3 weeks before Xander’s MLB debut, and had been playing 3b (brilliantly) to accommodate Stephen Drew.
Bogaerts reportedly did tell the Sox he was more comfortable at SS, but by then Iglesias and Drew were both gone, plus Xander did play 3b in the World Series.
Story only recently pulled off his adamance at playing SS. And there have been stories for each side about whether or not Bogaerts would move…