Fulmer spent the year in AAA last year until being called up for a double header in August, then being sent back down, and called back up for September. That really isn't what you are trying to make it out to be.
The kicker is outside of his emergency double header call up, he pitched really well for the White Sox in September (1.64 era, 1.000 whip, 7.8 K/9) , so does that mean Hahn was right to call him up? Even with the emergency start, his numbers with the White Sox in 2017 are fairly decent.