Like it or not Trump is being curve graded from here on out. Of course it's not fair and actually kinda dangerous, but just like his political doppleganger W, Trump is being handled with kid gloves now. The immigration thing pretty much shows that, at best you can say he's got no position and at worst he has no plan for the position he holds, but the media basically went straight to "pivot" rather than "WTF?", because Trump isn't being analyzed as a normal candidate. He's being analyzed as a reality TV candidate.
Speaking of immigration, it seems people actually have a bigger problem with Trump's immigration explanation than Hillary's handling of e-mails. The Hillary camp would be smart to keep pressing on this issue.