Spectre and Nano are the biggest marketcap losers I know of. Spectre at one point was 6 dollars or so, right now they are at 14 cents or so. That's not a normal fall anyone could cover. I know them from inside as well and they have absolutely no interest for their coins and even the owners and founders don't have much interest anymore. Hence, they will not be coming back, they are gone for good and that was a coin that was about 6 dollars per coin which was a lot at the time.

Nano may comeback eventually, the founders and owners are really working on their project and there is still some sort of interest to the project but that is mainly from the people who hold the coin and hope for it to come back. The price peaked at around 34 or 37 dollars and right now around 1 dollar, that is really hard to recover.