Didn't this happen with the 2013 DROIDs too? While it got 4.4 rather quickly, it skipped 4.4.2 and got 4.4.4 later.
Yes, in fact, Verizon made Motorola push a minor network update in May 2014 rather than 4.4.2 (or a build of 4.4.2 that included the minor network update), despite the fact that Motorola was ready to test 4.4.2. Earlier they also made Motorola include the Jellybean blue color status bar network icons rather than the white KitKat icons with the first 4.4 update (which I rather liked, but, still, Motorola obviously had to change the KK framework manually), though they finally relented with the 4.4.4 update.
Perhaps I shouldn't complain too much about that, as the 2013 Droids probably never would have received a 4.4.4 update if it did get 4.4.2, but the initial 4.4 build had some serious bugs that affected more people than the network update fix they pushed in May (which affected customers roaming in a particular part of Canada, as I recall.)
Again, Verizon does not handle this phone like a flagship. Instead, they market it for its battery life and its Verizon network features (XLTE and VoLTE) and even features that aren't uncommon ("turbo" charging), don't even mention the version of Android, and they don't seem to care whether it has the latest version of Android on it or not. If it was truly a flagship, Verizon would be aggressive about keeping it updated. Instead if they are aggressive about anything, it's that it supports the Verizon network features that they want to push right now.
There are any number of reasons why the update is not ready yet - maybe it's VoLTE not working right, maybe it's Verizon specific software (i.e., the command center widget) not working right, or maybe it's as simple as Verizon needs to update reference material for their call-in support technicians and hasn't finished yet. Or it could be that the leak that it was coming out last week made them stubbornly delay to try to tell employees that future leaks will be responded to in a way to discredit the leak so the recipient of the leak will no longer trust the leaker.
At this point, anything is possible, and it doesn't really matter why, does it?