Pure speculation. Trump has won battleground states like FL, NH, NC, NV, MO, and MI. Cruz has little crossover appeal. He and Kasich could not win their home states with 50% or more of the vote. Trump will win NY with more than 50% of the vote.
So now that the race is down to basically 2 candidates you think because Trump can get a higher percentage that is some how a achievement? Trump still has only gotten about a third of the vote.
You may see it as speculation but the polls noted in the article prove that it is not. Where are the poles proving otherwise?