As the miner is open-source now, and the difficulty chart can't be explained anyhow, the only one to ask you is how did it happen with the renaming and cloning the git.
There was no takeover. The original developer (who himself did a fork of bytecoin and around a dozen lines of code changes) was non-responsive and had disappeared. The original name had been cybersquatted all over the place (since the original developer did not even register any domain name much less create a web site), making it impossible to even create a suitably named web site. A bunch of us who didn't want to see the coin die who represented a huge share of the hash power and ownership of the coin decided to adopt it. We reached out to the original developer to participate in this community effort and he still didn't respond over 24 hours, so we decided to act to save the coin from neglect and actively work toward building the coin.
Eventually the original developer came back and now wants to work with the community. I hope you work with us as well. Let's let this one go and move forward with a great coin.