It seems that you aren't familiar with the meaning of words that you are using. Workers councils are made up of delegates that are voted on by the workers i.e. they are a representative democracy.

And why would you expect that this new elected body would be any more effective at advancing it's electorates interest instead of just its own?

I would expect that they would be more effective at advancing it's electorates interest than the owners would be at advancing their workers interests for the simple reason that the new elected body can be simply removed and a new one voted in.

what’s magical about workers? why wouldn’t they just be corrupt themselves

> what’s magical about workers?

Did anybody say there was anything magical about workers? Since you are asking this question you must think that there is something magical about owners so why don't you tell us about that first?

> why wouldn’t they just be corrupt themselves

How would that corruption play out?