Romney's prepared address attacking Trump was a big nothing burger and here's why: Romney is an acknowledged sharp businessman. At Bain Capital he researched failing companies with an eye towards purchasing at a bargain price and turning it around. He knows how to research a company's strengths and weaknesses; that's what he did so well at Bain.
His speech was a tired recital of four bankruptcies, Trump University, Trump steaks, Trump branded clothing made overseas, and some of the lame personal attacks: he's a conman, a fraud, all of the same coordinated Rubio attack lines.
But he never laid a hand, and no one ever has, on Trump's corporation, The Trump Organization. Everything Romney talked about had to do with his licensing businesses, which is a small potatoes sideline for Trump.
So, all of Romney's criticism was of vendors who purchased the right to put the "Donald Trump" name on products and services Donald had nothing to do with--except allowing his name to be used.
The Donald Trump Organization remains a powerhouse corporation. Mitt Romney who is expert at uncovering a corporation's strengths and weaknesses, found nothing to criticize in The Trump Organization. And let's not forget, too, that this was nothing but a political hit directed by the RNC establishment.
In other words, a great big nothingburger.