Verizon Wireless can't fast track anything if the manufacturer doesn't make it compatible in the first place. The ZTE phones are not compatible with the Verizon Wireless network.
Why isn't the Pixel XL not a contender? It is similar in size and hardware. It is also running a newer version of the Android OS and will definitely receive updates faster and longer than the Note 7 ever would if the recall and subsequent cancelation hadn't happened.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.