Mind you, Thomas was kept out of most drills involving any sort of contact, but he was in there at right guard during a running drill and quickly proceeded to get rookie free agent nose tackle Louis Ellis on the ground.
It was the first time Thomas was involved in any contact whatsoever since that 2008 opener against the Jets.
Asked how much rust there was on him, Thomas quipped: "I gotta get a tetanus shot."
Then he added: "It really felt good to go out there and put my hands on someone."
The Dolphins are taking it slowly with Thomas, who sustained a pectoral injury in the offseason because he's projected to start again at right guard and there isn't a great option behind him.
Second-year player Shawn Murphy, who was inactive for every game as a rookie, lined up with the first-team offense for the first three days of practice, but it was free agent acquisition Joe Berger at that spot on Wednesday.
Thomas is saying he's staying patient and just doing every day what the coaches are asking him to do, but also added: "If it was up to me, I'd run into brick walls."