Well, one of the murderers was known as King Victor of Brooklyn. So the dude likely has some Spanish in him (Victor) and he is a Latin Kings gang member. That gang prefixes their birth names/gang names with King. If you check his photo, he has notches in his eyebrows. 3 on the left and possible 2 on the right. 3+2=5, and the Latin Kings are associated with the number 5 because of their alliance with the People nation (5 pointed crown, 5 pointed star, rolling dice with the 5 showing, etc). If he isn't a Latin King, you have to be involved in some shady stuff at a high level to have a nickname like that in a tough place like Brooklyn. Otherwise you are food for the real stickup kids.
Few possible angles: The rumor of Michael Wright's sexual preferences and the men found out -homosexuality is one of the biggest sins to gangs, cannot recall if he was Muslim, they also are perceived to be intolerant of that; Wright got into a financial bind and "sold his soul" to get out and couldn't come up with the payback money; Wright double crossed them and this was revenge; Wright stumbled upon something shady that went down and the men were worried he was going to sing. Based on my being around Wright several times in my youth and what everyone else says about the dude, the last option would be my guess.
The robbery angle doesn't make sense. Wright didn't make NBA money, not sure someone like him was making more than 100k a year. You stumble across cash Wright kept in the house, you wait for him to leave and you stage a burglary, you dont kill the dude. Unless there was some sort of business deal where they set him up, he shows up with a suitcase of money and they robbed him. In that event, you set him up and get the baby gangsters and kids trying to make a name for themselves to do it. Then again, a long-term Latin Kings gang member or a high-level goon (needed to have that nickname), can make whatever cash Michael Wright has on hand in a day or two on the streets without killing anyone.