Yeah, he writes this, but then says - secure the border first, then there will be a “conversation.” That is what is troubling, or what part of that don’t you understand?
Cruz's point, a strategic one, was that the other side always tries to start the discussion with what to do with those illegals they can manage to present as 'good' ones, point out the current lack of consensus on that (Trump is at 30%+ in GOP primary, not, at least yet, a majority in the general,) then say that because we can't agree on e hard part argue that we can't do anything. Cruz strategizes to do the above parts, on which most clearly agree. If the wall, e-verify, etc. are working well, the sanctuaries are closed, the illegals with additional crimes are in jail or deported and of the rest self deport so that local and state budgets aren't being crunched, Americans aren't being competed out of jobs, and our culture isn't being displaced perhaps even the firmest Trump types would say 'good enough.' If problems remain then we can try to reach agreement on whatever else still needs doing to solve them. Without scaring the legal Hispanic voters into HRC's arms up front over about any general Hispanic round ups she'd confabulate.
I think it's much better strategy and more likely to get done than Trump's approach. And it leaves political good will for fixing all the other problems Washington created. Immigration is the biggest issue, but not the only essential one this time. Fix just it and we've lost. Cruz understands the whole scope of the problem and wants to fix it all. None of the others do.