As Symphonized pointed out they're not the same person and Edward have his own bitcointalk account. Stunna is still active you can see him post here and Edward is mostly active on the site (stake or primedice).
I don't think that ownership changed hands. The easiest way to tell would be to look up the WHOIS info on the domain or see if the cold storage has been moved to a new address.
PD/Stake are making great revenue and I don't see a reason why they would want to sell their profitable business, doesn't make sense.
Usually the sites that sell their business are unprofitable or if they are profitable the announcement gets made public. Because if its leaked that a site has new ownership it might be bad for business. As the new owners might not be as trustworthy as the old owners. Kind of like when Microsoft bought Github.