Well, that is kind of misleading to say that in votes Trump is outperforming Cruz by five to 1. Trump only has about a 700,000 vote lead, or ten percent of the votes.
Not true, Trump has over 2 million vote lead: 2,075,025 lead
Popular vote TRUMP 7,863,052 CRUZ 5,782,142
https://en.wikipedia.org/wiki/Results_of_the_Republican_Party_presidential_primaries,_2016