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You have it backwards.
They all have feared Cruz for the last 5 years. They all know that he will accomplish his goals.
Nobody in their right mind fears Trump. The election is way out of his reach, so all he can do is spoil the election for the GOP side.
Very few if any admendments or bills Cruz has submitted in the Senate
have been passed in the senate.
His fellow senators do not fear him. They dislike him, but do not fear him.
The next President will have to be feared to get anything done.
Otherwise, the RINO’s will clog up the joint, as they always do.