But they all had either better defensive tools or eventually outgrew the position, which is the problem with Xander, who's that big and isn't even done filling out. Peralta, Hanley and Jeter are good examples of guys whose defense eroded quickly once they finished growing into their bodies (Jeter was always bad but he was captain 'Murrica!), and many theorize that playing SS is part of the reason for Tulo's many injuries.
Who knows? Maybe Xanders could stay at SS for a while, maybe his whole career while being passable/good at SS.