Why only can choose either 1 to record only. If my hub been stolen then maybe few of my camera he not detected will be still got recorded his action.

Or if really can't recording for both camera and h500 (which I think can do so) if either 1 been disconnected other will start recording. If example hub been stolen then my camera start recording in it SD card

Why I buy hub is because if camera been stolen I still got recording in my hub. Vice versa that if my hub been stolen then my camera still got recording or at least start to recording in it SD card.