Jhonny and crew started their journey from Purplehaze city to the holy city , as while they had a clear objective of what needed to be done , there was no exact time limit given to them for the job and the entire heist was yet to be planned.
They couldn't use the city teleportation because all entries and exits to and from the holy city were logged , hence they were forced to take the long way out with having to ride anonymously for over 27 days to reach the desired location.
It was Bo's first major mission after his recovery from the attack a few months back and although he was not near the power level of the other 3 in the group due to his break , this mission needed brains more than brawn and his experience in the field was invaluable.
He was in-charge of leading the group undetected to and from Purplehaze city as in his break he had been studying topography of Omega and knew all the monster zones , roads and hidden tracks with the back of his hand.