Sorry if the topic sounds behind the schedule. Spare me please!
After watching Straw Hat Pirates' encounter with Bartholomew Kuma in the Sabaody Archipelago, a theory hatched from my mind. Kuma can't make the bubbles that protect those he sends to faraway places using his ability. Each time he sends a Strawhat someplace else, a bubble not faraway pops off. I think the Strawhats come in contact with these bubbles. The bubble then become paw-shaped because of the Nikyu Nikyu no Mi's effect. Kuma, as gentle dude, cares for the Strawhats that's why he thought of something to protect them from obstacles while they were being sent away.
Thanks, wishes to hear your opinion.