I don’t significantly disagree with you about try it all. I just think back about the quickest way to get to the heart of the matter in negotiations is to take the hard line right down the roster. You’ll either get to what the other side really wants and has to get out of it, or you’ll be at an impasse.
To take issues separately without the benefit of the harshest position possible, you relegate yourself to trying to figure out from each point on the list which is most important to them. It is with each of these separated issues that your side can be most exploited.
1. To accomplish what he says he is trying to accomplish i.e. the reining in of Obama, the stopping of the Iran deal etc.
2. To expose Rino Republicans and get them on record which they have been quite artful in avoiding up till now even when they no longer have Harry Reid to thank.
3. To get himself elected president.
I'm not sure whether Cruz has one or all of these motives nor can I venture which he finds the most attractive.