I would be more surprised that Verizon would allow somebody to transfer their upgrade to somebody else. Not sure about that one. But somebody is bound to know in this crowd.
That's possible. All you have to do is buy the phone on the account with an upgrade, don't activate the new device, swap out SIM cards on the device you want to upgrade. I'm not sure how that would work on the Edge or the Next plans.
I had to give my upgrade to my mother who had her phone stolen a few months before she was eligible for an upgrade. Verizon wouldn't allow her to use her own upgrade (which was set to happen a few months later). I had an extra line on my account so I let her use my upgrade to replace her stolen phone. I told her that when her upgrade became available that she couldn't give it to anyone else (my sister and her husband used to be on their account and had a nasty habit of taking my parents' upgrades away from them). Fast forward to now, my mother isn't pleased with her current LG G2 and wants me to upgrade so she can have my Note 3 (even though I told her that my device may not be much better than her current device).
If I didn't have this upgrade, I probably wouldn't jump from the Note 3 to the Note 4 as the only feature I'm looking forward to seeing is the Note 4's UHD.