Tony Watt is a player. Really, a player.
There are guys at all clubs who have the experience to play the game in an effective way. They have learned how to best use their strengths, or their specific talents. Stephen Dobbie was such a man at QoS, a really clever player. Jim Duffy at Dundee, Andy Ritchie at Morton. There are lots of examples going back decades.
Watt is one of them. He'll be better next season, and better again the season after that.
Other players just get older and slower and never seem to quite learn the tricks.