I'm not sure what you mean by flags, however you're entitled to your opinions just as everyone is, but don't confuse opinion with facts.
The fact is KB2919355 caused corruption on not just a few hundred users' computers and workstations, but thousands. Seeming as the probability of all computers being affected had corruption prior is so high (a ratio of billions to one) it renders such a hypothesis as fundamentally flawed. Its ocam's razor... the most likely cause is the simplest, Microsoft screwed up. You have to give them credit though, they screwed up so bad, that have no idea what caused the screw up. This reminds me a problem I had two weeks ago with ICS sharing from my phone. I'm extremely vigilant about my firewall, and have it locked down extremely well... so well in fact, I wasn't able to create an incoming connection from my device, as I put multiple barriers in place to prevent inbound connections and any software that required an inbound connection was locked down even more so than others. The simplest of answers is almost always the correct answer.