So, to translate your translation...
Control is what the users give to whomever they want.
If the vast majority of users choose to give control to a group of people then that group of people will continue to have control for as long as the vast majority of users give them that control.
That seems a bit obvious.
Each user chooses for themselves what software to use. If lots of users choose a single piece of software, then that software has control over what those users can do with it, and the creators of that software have control over what that software does.
That's pretty much how decentralized control is intended to work, isn't it? Nobody has any more control than they are given by the users, and can't maintain control if the users choose to take it away.
This applies pretty perfectly also to USD and FED and so they are also perfectly decentralized. New stuff learned every day. I cannot think of anything that is not perfectly decentralized except maybe something in north korea.
But let's get back to reality. I have not heard any such definition for "decentralized control" which is intended to work like you say. "Decentralized control" is something where the system works having the control itself decentralized.
centralized control= one person/group makes the decision and everyone else either follows or they can get lost
decentralized control = everyone is equal, and if there shows a majority of consent that something should change, then it changes.
EG
centralized = one team change code and say upgrade or be paralysed, or f**koff
decentralized = every users flags a desire. if a majority show similar desires then that desire activates.
EG
softfork does not need 5700 of 6000 nodes(95%) 'permission' / consent to activate, it can function with just 2 nodes. causing the other 5998 nodes to not understanding the data that the 2 nodes are transmitting, but pass it along anyway