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From the headline, I thought this was going to be about Cruz, who actually does display narcissistic tendencies. He is personally abrasive, and has the ends justifies the means attitude of many narcissists. Most narcissists never accomplish anything, because their personality does not allow them the kind of self-reflection that helps people improve themselves.

Here are selected traits of narcissistic personality disorder, as listed by the DSM-5:

Having an exaggerated sense of self-importance
Expecting to be recognized as superior even without achievements that warrant it
Exaggerating your achievements and talents
Requiring constant admiration
Expecting special favors and unquestioning compliance with your expectations
Taking advantage of others to get what you want
Having an inability or unwillingness to recognize the needs and feelings of others
Behaving in an arrogant or haughty manner
"Although some features of narcissistic personality disorder may seem like having confidence, it's not the same. Narcissistic personality disorder crosses the border of healthy confidence into thinking so highly of yourself that you put yourself on a pedestal and value yourself more than you value others." Source: The Mayo Clinic
Note that I did not include other traits which one might deduce or guess from Cruz's behavior, for which I have not seen direct evidence. The second item, not having the achievements that would support one's claims of superiority, is especially relevant, as Cruz is trying to convince people that he is qualified to be president without demonstrating having the requisite skills or experience. Also, the item about taking advantage of others--does Colorado sound familiar to anyone?
Now, your statement, "Trump being surrounded by uncouth, combative and ignorant yes-men is a problem.," is a gross mischaracterization. Trump surrounds himself with experts whose opinions he listens to in order to make informed decisions. A president needs to be able to do that. Those who surround themselves with "yes-men" rarely achieve much because their inability to listen prevents them from identifying and fixing problems. Hitler, for example, surrounded himself with "yes-men" and threw tantrums any time one of them said something he did not want to hear. So they kept telling him that the Germans were winning gloriously, when, in fact, his war effort was collapsing. Other dictators surround themselves with yes-men, as well--I have never heard of a dictatorship that was also a bastion of economic growth and freedom, have you?