Absolutely does not mean that they will remain there when/if trading resumes. Might go right back where they were.
Highly unlikely. Being on the Greys mean they've lost compliance with SEC Rule 15c2-11. In order to regain it, they must find a market maker willing to prepare and submit a Form 211 for them. That is not easy when the company has regulatory problems. And should a Form 211 be submitted, it must be approved by... FINRA.