Ominous Convergence
The so-called Larkinson mech for a lack of an official model name served several purposes.
Aside from the reasons that Ves already mentioned, he withheld a more profound and important reason from his fellow clan members.
Though he already trusted them to an extent, it was far from the level where he was willing to reveal some of his more sensitive secrets.
Even now, Ves harbored no intentions to reveal the true nature of glows. None of the Larkinsons were aware of the existence of spirituality or design spirits and how they all tied to his design philosophy.
It sounded a bit pathetic that Ves was more willing to share his secrets with Gloriana than his own clan members!
Was it because he distrusted his family? Perhaps.
The truth was that it didn't serve the Larkinson Clan very much to learn his secrets. While it might improve their ability to pilot his mechs, it wasn't worth the chance of exposure.