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In any sort of all-male environment, the laws of seniority must be strictly adhered to.
In human cultures, dating back millennia, there have been rights of initiation, often along the lines of the more senior members sending out the young guys to perform humiliating tasks, hoping that they embarrass themselves in front of everybody else.
Just because, in this analogy, the right of initiation is for a rookie to play a position he's never played before—and "everyone else" is a national audience of several million people—doesn't mean the basic principles don't stand.
Somebody's got to man up and play third base, and it sure isn't going to be Aubrey Huff, who's had enough position changes for a while.
Therefore, Belt, the rookie, definitely gets the onerous task of being the first lefty to play any infield position other than first base since 1896—the year Bill Hulen played shortstop for the Phillies.
Maybe his teammates can have him pull an all-nighter, chugging beers before his first start while they're at it.