I think this thread started off as a legit question - When did Anderson go from being a contender to running away with the title? That, to me, is a legit question. It's not, "when did people start to see him as unbeatable" as the thread has taken a tone change to, but rather what variables in Silva's game have changed to make him appear unbeatable?
The mention of getting his BB BJJ was a good observation. I might add that maybe his footwork has even improved... I like the question, but I don't really have much to offer to answer it. Dude's definitely a beast though.
Touching on the comment about chinks in the armour of some of the top guys. I wouldn't call them chinks in the armour, but I would call them the thinnest areas of an already thick armous protectant. Silva is great everywhere no doubt, but to beat him, it needs to be done on the ground. So, if Lutter was able to get the fight there (and get lucky a flying knee missed his face a second time), not gas out or make pathetic arm-bar attempts in the mount, Silva could lose. GSP got rocked by Serra (who's pretty heavy-handed) but it shows where he is most likely to lose if he does. Fedor has gotten cut, and it's his only blemish, but IMO pretty much all fighters cut. BJ Penn's head is an exception in MMA, not a normality. Although Fedor has yet to show any other thinning of armour, maybe his smaller HW size could finally catch up with him, if he were to face a fighter with significant reach advantage, solid striking, and good BJJ defense.
"I don't dink anyone en dis division can endure my riddum."