As I mentioned in a different thread concerning this issue;
Many of us speculate that Kuma sent Luffy somewhere on purpose because of the brief and concealed conversation he had with Ray as Ray was fending off Kizaru. We, as the reader, are not even let known what was said. People automatically assume that Kuma told Ray where he sent the SH, and we speculate that reasonably so due to the context of the scenario.
IMO, the conversation (whisper) wasn't long enough to tell Ray where EVERY SH was sent specifically which kinda kills the original speculation for me to that end.
Honestly I personally believe Kuma sent Luffy to this island for a reason. It was proven by Sent's words that Kuma knows where he sends you, it is NOT random.
Him asking you "Where would you like to go" has been taken more as a punch-line than a literal question, whether he says it or not doesn't really affect whether he knows where he sent you or not, IMO.
We have little to no information connecting Kuma, Boa, and the Amazon island, so at this point there really isn't any room for speculation with evidence, all that we can do as readers is exercise patience as Oda unfolds these events in his time.
I am more concerned about where the other SH are than Luffy. Im looking forward to some tuesday spoilers (maybe?) so that we can see either what happens with Boa or the other SH.
You could see it as Kuma chooses who he will give the option of choosing their destination everyone else he sends flying he doesn't put much thought in to it just making sure they land on an island.
How do you know this?
What do the SH have to offer to Kuma to make sure they are alive? He could have easily sent all of them flying right into the ocean, almost guaranteeing Luffy, Robin, Brooke, and Choppers death. If he really was following WG orders, the SH would have been dead a long time ago. Kuma is showing the traits of having a personal agenda (like most Shichi's) but he heads the call of the WG as more of a priority than the other Shichi's which caused him to gain the title of "Most Loyal"( being the "Most" loyal doesn't mean you are "completely" loyal), but even so, that doesn't mean he believes or agrees with the actions requested and/or performed by or through the WG.