Sentence:  Breakthroughs like having <WSD>insultants</WSD> around because they're prepared to buck convention and challenge the fundamental assumptions of the business. Outsiders serving as <WSD>insultants</WSD> are generally best because they feel no need to defer to the preferences of the CEO in order to enhance their promotion prospects. 
Meaning of the word marked with <WSD> tags:  A consultant who is willing to criticise the organisation that they work for.