So after you deliberately argued that this holy knight is Shanks, now that you have been embarrassed you are switching to the next topic.
Loki wanting to destroy the world isn't directed towards a particular enemy, he just wants to go on rampage, and he already has a grudge against both renowned pirates (Shanks) and his own hometown, which the Holy Knights hope to utilize for themselves. Plus, Loki is chained to the tree for 6 years, so he is in a position where he can be blackmailed, with the Holy Knights literally killing his beast pets to blackmail him into agreement.
Kaido after his career on Rock's ship went on to conquer Wano, where he was portrayed as the embodiment of might. The WG was scared to even enter his home turf. Well, you had the CP0 being humiliated by Orochi, who was confident facing the WG's top agents because he had backup from Kaido.
@The DevilMaster