I walked into a VZW corporate store a week or two back, and played around with the Moto Z Droid. I went into Settings --> About Phone and tapped on the Build number enough times to open up the developer settings menu. Under Developer Settings, there's a switch to "Unlock Bootloader". I toggled it from off to on, and the phone seemed happy enough before I left.
I do realize that this toggle under developer settings may mean nothing and may do nothing to actually unlock the bootloader - just relating what I saw.
I did ask the retail guy if it was for real, of course he didn't know, but when I asked him why VZW was so anal about locked bootloaders when they sell Nexus devices - he said that he thought attitudes were finally changing there.