The problem why rarely ALL players honor
So the reason why you rarely get the bonus reward when all teammates honor, is because of the automated exiting of the game, in this example after game I did not press continue and went to eat and when i came back this is what was infront of me.... it pressed continue for me and the "Honor" timer expired, so I could not honor.
https://image.prntscr.com/image/JZFYC-epSFuOJVNI1O503Q.png
So if its posible, riot please make that AFTER the honro timer expires that you can still honor, or atleast dont make a auto continue from victory or defeat screen. :(
This is not a bug, but it is not something what should be in game.