why didnt zoro and sanji sense any of the threat on the island?
loki luffy and gaban all sensed them
gaban sensed them when they were hiding themselves
gaban is on a whole different level then luffy and loki when it comes to haki
luffy and loki are on a different level then zoro and sanji
gaban > luffy > loki > zoro = sanji
luffy and loki beats gaban due to bad stamnia thats it