I think Killingham is above Sommmers in authority: Killingham has been polite up till now, but Super Sommers' suggesting taking back Yonkou crewmembers of Luffy was enough for Killingham to snap and straight up call Sommer's a dolt:
Super Sommers was fine with bringing back the Straw Hats, until Killingham spoke up.
IMO, Super Sommers is stronger, or close to as strong, but Killingham has a higher rank because Gunko and Super Sommers are selfish and deviate from the mission. Gunko is trying to turn a Skeleton Pirate Rock Star into her personal Mozart, and Super Sommers is just... kinda unhinged.
Killingham is by far the most competent person here, the only one prioritizing the mission.
Super Sommers only snaps at Gunko AFTER Killingham reprimanded him: Super Sommers was pissed Killingham corrected him, and took it out on Gunko, IMO:
I believe Killingham is an inherently kind individual: he looked sad, when he said they had to wake the kids up from their dreams.
Perhaps Killingham pities slaves, and uses his powers to give Mary Geoise children sweet dreams? That's cool, I love Killingham, seems like a future traitor to the WG. We'll see.
Gunko's trying to get Boned, Super Sommers is trying to get kids to murder their parents:
Killingham is carrying the God's Knights, man is a boss