This is quite the big decision in more ways than one, it's also the first major order made by Jeff Jackson, the new CEO after Ken Holland.
Re-signing Cam Dineen offers the Oilers additional depth on defense, an area that needed bolstering. Dineen is a force to be reckoned with, and his place on the team will be important towards its dynamic in the future.
With this out of the way, the Oilers have surely turned their sights to keeping Draisaitl on the team. Jeff Jackson has been very open about how important it is for the team dynamic to keep Draisaitl.