Obviously only killer Luke Mitchell knows what time he returned to his crime scene
But regarding him risking returning to his crime scene and ‘getting incriminating DNA on his changed clothing’; his murder of [Name removed] is surely evidence enough that he didn’t really care about such risks. Plus if he wore gloves when he returned, to say for example, inflict PM injuries (Or further PM injuries) or replace [Name removed]’s socks, there would be no reason for him to get incriminating DNA on him if he was wearing gloves
Does anyone know what the results were regarding the boots he was wearing ?
While he was intelligent, cocky, arrogant and insubordinate beyond his years, I doubt very much he risked returning to the crime scene in his changed clothing -- especially in those white snowboarding boots that the police confiscated at Dalkeith Police Station during the early hours of 01.07.03 along with his shiny green bomber jacket, black t-shirt and black baggy jeans. Of course, as you say, his psychopathy, sociopathy and narcicissm, along with his arrogance, intelligence, detachedness and cockiness, perhaps made it easy for him to make the decision to return to his crime scene. There was ample amount of time for him to do so (from 1740 - 2315) and he was not seen by anyone for expansive amounts of time over the course of that evening (not seen by anyone from 1825 - 1930 and again not seen by anyone between 2100 - 2200; and, of course, as SM proved in court, LM wasn't in the house at 1650 when he got in from work; and then LM wasn't seen, either, even though he claimed to be at the end of his street, on the Newbattle Road between 1740 - 1800, which was peak traffic time on a relatively busy road). So, yes, copious amounts of time to revisit the locus. If he did return to the locus between 1740 - 2315, I would think he did so in another pair of black boots/trainers (because I think the pair he was spotted in by AB were destroyed along with the parka and all other clothing AB saw him in at 1654). I don't think he'd risk wearing white boots, outwith him wearing them whenngoing to meet tge search trio to lead them to the body (his leading the trio to the body was pre-planned, so he would have had no problems wearing them when going to meet them at 2315).
On the subject of LM's cockiness, arrogance and mental/personality disorders, etc, while he did think he was untouchable (as evidenced by his swanning around town and night clubs like a strutting peacock, living off of his notoriety as a murder suspect), he certainly let his guard down at times and made the police's work easy for them (prime examples being telling them exactly what clothes Jodi was wearing that night, in spite of claiming to have never seen her at all that evening, and leading the trio to Jodi's body as quickly as he did). Having said that, there were things that had taken place outwith Luke's control before and after the murder, so it was always going to be an almost impossible task to cover his tracks, and this, coupled with his naivety, certainly proved that way. Thankfully, too, the police were always one step ahead of this evil and very cunning young lad.