Ves did not have the right to make decisions on behalf of a peak ace pilot.
If General Axelar Streon wanted to stake all of his chances on a single throw of the dice, then that was his decision.
He understood the pros and cons of every possible approach quite well.
He knew that there were good reasons why most pilots like him embraced the more modern approach of going the four phases of the Mech Body Merger Process in four measured steps.
However, Axelar willingly threw aside this reliable option and embraced the suggestion made by Gaia without hesitation!