Absolute nonsense.
To employ the phrase "...and that takes the cake (UK: biscuit)" is absolutely NOT an example of
non sequitur - however much you would like it to be so. It is nothing more or less than an expression of incredulity at what had been said. In many ways, it's synonymous with the phrase "....and I find less possible to believe/trust than most things I've ever encountered". You definitely need to read up on what
non sequitur actually is. There are plenty of good books about it in the British Library.
And "etcetera, etcetera" is what a logician might call "weasel logic", which is almost always employed to disguise a failure to counter an argument.
In passing (but drifting off-topic), "lots" absolutely can be used with a collective noun in the singular verb conjugation:
there is lots of evidence; there has been lots of rain; he has lots of courage.... So you're wrong on that one too. Again, I'm pretty confident that there's a good book in the British Library which will teach you all this stuff.
And, in even more passing, it's entirely correct to refer to "giving (someone) an education (in something)". Once again, the British Library will no doubt be of valuable assistance in this matter*.
Anyway.... you ARE aware, aren't you, that there's zero credible, reliable evidence pointing to the participation of Knox and/or Sollecito in the Kercher murder? And that the only credible, reliable evidence that DOES exist points solely to Guede as the attacker/murderer, and it's all entirely compatible with Guede as sole attacker? Because that's the real topic of this thread, and where self-education efforts should therefore be most directed.
* ETA: Here, as an example, is a press release on the Royal Opera House website, entitled: "Every child should have an education in arts and culture".
http://www.roh.org.uk/news/every-child-should-have-an-education-in-arts-and-culture
cf. "If Vixen requires yet another education as to why the evidence against Guede was in fact incredibly strong...."