Off course you can. Thats a hoock for readers: What happened? How did Things change? etc...
If they never explain it then yeah thats dumb, but part of the fun of a timeskip is not knowing everyting that has happened. Thats why DC did it after infinite crisis and Marvel did it after Secret War.
Back in the day readers, the 80s, readers had no idea for months how Spider-man got a new Black suit.
This is not a new thing. It can work.
Sure it might very well fail, but there are previous examples of where this actually worked fine.