I also thought Carlos was a bit too far back to normal given how hostile things left off between him and Harry at the end of the last book.
I totally agree with this, he did the same thing with Thomas and Harry's relationship after Turn Coat. At the end of Turn Coat Harry was very unsettled with what Thomas was saying at the end of Turn Coat and there appeared to be a split between them, then in the next book it was like it never happened.
I also noticed that Harry's attitude towards Wardens beheading suspected warlocks and those who do Black Magic out of ignorance maybe had come to resemble the Merlin. In Proven Guilty Harry was for at the very least due process for the accused before his or her head was lopped off, why the Merlin argued that 1] too many of them and too few wizards willing to take on the Doom to try and help these kids. 2] That too many were too far gone and there was no reforming them so they had to lose their heads, not doing that was too costly. In Twelve Months, Harry has seemingly come around to that view.
