These specific items, and whatever the blood analysis/DNA might show, must be very important to the case (the order is signed by the DA, the defense attorney and the judge, with the prosecution and defense splitting the cost for the independent testing). I assume the DA/LE believe the items played a role in the crime.
So if the stun gun was used, I think it's more likely that it was used on Gianni (based on what we know about Sal and Ilona's crime scene, I don't see where it would fit in). I wonder if the autopsy could show marks from the stun gun, given that it took 3 weeks to locate Gianni's body.
From the warrants released, we know that Gianni called his cousin MD at 23:33 (MD believed GB was at the mall waiting to pick up Ilona). 9 minutes into their conversation, GB asks MD to wait or hold on, and then the call was disconnected. MD called back but there was no answer (per the warrants, GB's phone was turned off at 23:43). The fact that MD didn't hear anything in the background just before the call was disconnected (e.g. talking, a struggle for the phone) has always niggled at me.
I picture Gianni sitting in his car in the mall parking lot, maybe with the window down, calling his cousin to pass the time until Ilona gets off work. He must see or hear something (I'm guessing someone approached his car) which prompts him to tell his cousin to hold on. Whatever happened next, happened quickly (and relatively silently). Shortly thereafter, the call is disconnected/the phone is turned off.
If the stun gun was used on Gianni at that point, there must have been a reason to want him alive, at least momentarily. Otherwise why not just shoot him, like Ilona and Sal? After all, Ilona was shot while she was on the phone (and her phone was not turned off or taken). :thinking:
By the way, do we know what kind of phone Gianni had? Whoever disabled/turned off his phone knew how to do so quickly. IIRC, the phones seized from the Mercado residence were Samsung. (I have a Samsung and whenever I have to use an iPhone I'm totally lost).