One of the first transactions of the Marlins’ 2021-22 offseason finally has a resolution. On Saturday, the Marlins sent right-hander Josh Roberson to the Rays. He represents the player to be named later that they agreed to trade in exchange for Louis Head. The timing is not a coincidence—exactly six months have passed since the Head acquisition (November 14, 2021), which is the maximum time period that MLB teams are given to determine PTBNLs. The Marlins drafted Roberson in 2017 out of UNC Wilmington. It took him a full year to make his professional debut as he rehabbed from Tommy…