So I've been re-reading the chapter seeing how spoilers are out and we will soon get our hands on the next one.
This time around it hit me : while Luffy is feeding himself, between the two panels where we see Kizaru react to Bonney and the capture of Sentomaru, he has moved. If you look carefully, the first time Kizaru is apparently lying on the ground with his arms spread in a cross and rubble scattered around his head.
When we next see him, however, he is sitting with his back against a different block and his mantle is falling on his shoulders, unlike before. He is not in the same spot he used to be and something happened in the meantime. It could just be him gathering enough strength to sit up, but it leaves an opening for much more.
This doesn't rule out Caribou intervening, but I can't picture him being fast enough, or able to erase his presence, that he would go unnoticed by Saturn. Kizaru, on the other hand...
Put together with Greg's comment about his latest column, I wouldn't deem impossible that the "shocking news" yet to come is in part about a certain admiral turning coat, or Saturn eventually realizing what he has done and dishing out retribution.
(yes, the wait is rather long and I am getting bored. )