What most of the Dragon Ball community wonders is that what is to stop the Grand Priest to become the villain against the Omni King. He is the strongest Angel who far away exceeds the level of someone like Whis. He acts as the caretaker of Omni King who is a childish character who can be manipulated into doing anything. As the Omni king is always bored, the Grand Priest keeps suggesting new stuff to entertain him. The Tournament of power that threatened to erase most of the Universe could also be something that the grand priest suggested.
This is just a theory at this point. Angels have been super obedient to the rules that have been set for them. They take special care to not take any action beyond their jurisdiction. They have been trained to look after the God of Destruction they are assigned to. In the case of the Grand Priest, he is assigned to the ultimate God of Destruction, Zeno Sama. It would be an amazing twist in the story if Grand Priest turns out to be a villain. Will Goku have to surpass even that level? This theory has countless further possibilities but let us not speculate too much ahead of time.
