In the end, the Hollywood Foreign Press Association went with the most predictable choice: Gary Oldman for his awardsy (if outstanding) work in Darkest Hour.
Would it be Gary Oldman, unrecognizable and inspiring as Winston Churchill in Darkest Hour?
It was one of the deepest and most competitive categories at the 2018 Golden Globes: Best Actor in a Drama.
You could argue for a frontrunner, but you could also argue that any of the five could have won.