You call it inherited code, Fluffy says it was down to a scammer.
Well what does github say? Oh yeah, that's right you already posted the 'blame': Documented and proven to have come from Bytecoin and not been touched by anyone since.
And now, thanks to you, it is also demonstrated to have not even been used, either because thankful_for_today didn't have access to (or even know about) the optimized miner, or was too honest to use it.
Nice job investigating of Monero's "scam launch" by showing that it was cleaner than anyone even knew. Don't quit your day job.
Maybe you should take a close look at Dash. I bet you could find some deception, manipulation and instamining there pretty easily, if you chose to look. Who knows what other dirt you might find. Could be interesting.