Yes, owners (outright like the Barclays thru Press Holdings, or publicly traded like Murdoch) do choose editors, and thus editorials (and more) - but the slant of the paper has to have an audience. I don't think content is a wrapper for delivering editorials, it's a wrapper for advertising products and services. The 'conventional wisdom' is marketing ;-)
But I know we'll have to agree to disagree on this one. You can't be me, I'm taken
But I still don't see (in your picture) why wealthy businessfolk like to own newspapers if it's such a constraining and unprofitable deal - unless there's another side to this, which is influence in the political debate.
I see most of the major media owners as engaged in a charade of influence. You can't be me, I'm taken