No. The GOPe is faking like they back Cruz. They will never support him if it means he wins. He is a placeholder, nothing more.
Why would they fake it? Why would prominent members of the GOPe endorse Cruz if not to head off Trump?
Answering for you (perhaps):
1. Support Cruz to keep Trump from 1237.
2. Turn 1300 Trump and Cruz delegates into (fill in the blank) supporters and steal the nomination from both Trump and Cruz.
Do I have it right this time?