The move is a curious one, because Tolleson was sent back to Albuquerque on Wednesday to make room on the roster for the acquisition of Randy Choate and Tolleson hadn't even reached Albuquerque on Thursday. He was turned around in Dallas and wasn't in St. Louis for the start of Thursday's game.
The Dodgers could have just disabled Kennedy on Wednesday to make room for Choate without sending Tolleson on his useless journey. No explanation was given for why they did not, as the move was announced just before game time.
Apparently, the roster manipulation is related to whoever the Dodgers will come up with to start Friday night's game in San Francisco. The most logical candidate would be Stephen Fife, but he will be one day short of the mandatory 10-day period to remain in the Minor Leagues after being sent down July 18.
The only way he can start Friday is if he replaces an injured player, so the Dodgers might find one.