How strong do you think they were ? Compared to Yonko/admirals we know ?
and DR Xebec / HK evil Harald ?
DR Xebec Could probably be a PK level as where i put Xebec at his Peak If him wasn't dead, Harald EVEN with DR o put Yonkou tier, because was a early adult 1B Shanks, Old and Rusty Gaban and a early eated Mythical DF Loki to put him down.
The only One i put nearly Yonkou tier is Loki at that time, DR Harald for me is a Yonkou tier.