Per the vMA documentation on pg 15 it states the following:
To configure unattended authentication (authentication from vi‐admin or root context) to Active Directory
targets, you must renew the Kerberos tickets for the domain user using which the target is added.
It sounds like you're just relying on adauth for your users, so the account that you actually use to add the targets is not really relevant in this context so long as it has the right permission if I'm understanding you correctly. You only need a kerberos ticket if you plan on using vi-admin/root user to perform unattended authentication to your AD, which it does not sound like you're doing in your case.
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The doc is correct. I did some tests and when using adauth it doesn't matter which account adds the server to the vMA.
I also did some tests with the keytab which i created with ktpass, but it doesn't work right. After some searching i found this problem occurs a lot.