They returned him specifically in 13-14 to play center in Halifax. They basically demanded it of the team so he wouldn't stay in the NHL. 14-15 was the transition year for him at wing as a rookie (Tampa almost always breaks in their centers with a year on the wing). When the playoffs rolled around, ironically, they caused a stir when they played Marchy over Drouin because he was more effective (this started a chain of events off the ice). They wanted to work him to work on things to play center that summer. Worked with him at that camp at center, but it clearly wasn't there. So they put him back at wing to start as the friction between parties was already there. Upon the demotion to Syracuse, he was told to play center and Zettler was told to keep him there. This lead to the walkout and trade request. Upon his return, one of the softening of demands from Tampa was to let him play wing. Were Drouin played and played pretty well for Syracuse upon his return. He then had his fantastic playoffs that season upon his return to Tampa.
16-17 he was penciled in, again, to play center and they flirted with it in camp... but it was clear it wasn't going to work. They pushed him to wing for the majority of this season, even when Stammer got hurt. This is when Point emerged and Gourde was playing so well in the AHL that he was going to be given a chance. With the opportunity to sell high, they took it and Montreal started the center drama all over again.
I honestly feel a bit for Drouin in this. He knew center wasn't his spot, teams kept trying to force it and it certainly had a large impact on his career.
Your memory is impeccable lol. Makes sense why I don't remember him playing center in the NHL.