I guess it doesn’t really matter now that Cruz isn’t going to be the nominee.
So, what has Trump done to prove his Conservative cred?
Since you brought it up...
As far as bloviating, have you watched any of Trumps speeches? Or Tweets?
Seeing a candidate "prove his conservative cred" is just not on the minds of most Republican voters this election cycle. They're more concerned about illegal immigration and bad trade deals, and the negative impact those have had on the US economy and living standards for the past few decades.
By the way, what is the proper conservative position on illegal immigration and trade deals in general? And what conservative would you say has "proved his or her conservative cred" on those issues?