Yup I meant BE in terms of live upgrade.
We have a server which has zone roots in a separate pool and we did the patching through live upgrade in it, when we created the new BE it created a snapshot for each zone in the zonepool for that BE.
In your environment you have a pool for each zone, so after lucreate you will find a snapshot for each zone in its pool for the new BE [you can see that in zfs list where another zone root path will appear with BE name in it].
You can refer to "Exercise 11: Using Live Upgrade Patching with Solaris Zones" in the following link
Solaris 10 Patching with Live Upgrade - Solaris - wikis.sun.com
Regards,
Vishal