The benefits of integrating a Mentalist Crystal into the Minerva was far greater than integrating it into any other high-ranking mech.
While Ves believed that putting a Mentalist Crystal in the Dark Zephyr would make Saint Tusa sharper and more responsive. It may even help him utilize the Banish resonating ability more effectively, as the precise manipulation of Erlemin forced Tusa to be precise and detailed in his power application.
However, the benefits were too marginal compared to using other hyper materials. The Dark Zephyr was a fast-moving mech that Saint Tusa piloted more with his highly developed instincts and intuition as opposed to his mind.
The Minerva Mark II was different. Under ideal circumstances, the upcoming ace command mech shouldn't even fight her adversaries directly, let alone move from her commanding position from the rear.