What have I read? The initial newspaper reports, then virtually all the books on the market, incl WTBH and HB.
Whether I believe Curatolo or Quintaville - or indded any witness - is irrelevant. That is a decision for the judges to make, and it should be respected.
Why? Allow me to point you, for example, to the Shrien Dewani trial, accused of conspiring to murder his new wife in South Africa. Now, on paper, his behaviour looked suspicious, he had clandestine meetings with the taxi driver, whom he gave SAR8K (?) "for a helicopter ride". He then claimed to be mentally ill for three years.
On paper it certainly looked grave for Dewani, especially with SA demanding extradition. Come the trial, we soon saw a very different picture, with the key witnesses showing such unreliable and false testimony at every step, the judge was forced to throw it out.
I don't care what they do in Mexico, but it is unsound to judge someone "on paper."
It is up to the expert witnesses to review the quality of the DNA evidence. Did not the defense cross examine Curatolo and Quintaville?
At the end of a trial, it is all down to what testimony, on balance, the judge/s prefer to accept.