I only signed up for this site after coming across the threads when searching about this tragic incident. I don't know why this story captured my attention so much...perhaps because the victims seemed so young and full of life with so much to live for or maybe it is because I have lived in san diego for 10 years and used to live in some apartments right by where this happened and would go to the mall there.
My ideas...when I orginally heard the time everything happened it screamed of some kind of drug deal type situation. ALOT of young people in san diego frequently buy "party" type drugs (Molly, E, Coke) (at least people I know) and oftentimes will buy for a big group of friends for events and what not. I have had friends who ended up getting more involved then they planned because other friends heard they had the connect and it expanded. San diego is kind of like that, it seems big but is composed of a bunch of smaller communities and everyone knows everyone in certain circles. I'm thinking some how they got mixed up with a bigger deal or the wrong people with Riverside ties and somehow things went wrong.
It could have gone something like this....one of the three gets in connection with someone with ties to Riverside...they were floated "product" and then something went wrong maybe Gianni went to meet with the person at another location (near Friars) while salvatore and Ilona waited near the mall. The person kidnaps or kills or holds Gianni hostage random to try and get the drugs or money back. The killer had to kill Salvatore and Ilona too because they knew that Gianni was meeting with him so they could identify him. Then they take Gianni back to Riverside (where they feel more comfortable and know the area) and try and get him to produce the cash or product. Eventually Gianni is killed as well Seems like there are some holes and definitely alot of whys but just throwing out ideas.