Those suggestions aren't plausible based on the data, but don't take my word on it. I suggest you check out the interviews of the multiple pilots and radar controllers about the event, including the detailed reports and timelines, correlating visual report with electronic data. Including the near collisions that happened on the east coast in 2015. Radar malfunction has been ruled out, although the pilots radar systems actually experienced active jamming, which is a technological phenomenon (and actually an act of war if it came from another nation), which is why they couldn't actively track but only passively track via the pixels on the FLIR system. Yet the electro-optical data verifies that whatever the signal is it is of a physical nature, reflective, IR signature, etc etc, it's indisputable, and supported by multiple eye witness. It's not a projectile, at least, you should read the report (what kind of 'projectile' sits still under and above the water, moves erratically like shaking a pingpong ball in a plastic cup, then accelerates at 30x the speed of sound without a trace.).
They are the ones trained to observe and detect these phenomenon, and if they could offer a plausible explanation that didn't make them look crazy, they certainly would. It's not my opinion, I'm just relaying whats out there. The simple fact is, its all been considered, and nothing fits. They can't say what it is, but they can certainly say what it isn't.
By all means, it could be anything, but whatever you can suggest, it must at least fit the data.