I think the fact that he was stabbed fifteen times is overkill, which means drug induced rage, or....crime of passion.
So they are out partying at the bar, he is with his three female friends and cannot dump them. We do no know JC sexual orientation, but the two suspects are attractive, young, weathly, connected, well built dudes. Perhaps light flirting was going on with one or the other suspect. The bar closes at four a.m., they go back all together for the after party as JC would not ditch his female friends. The party continues into the morning. They walk out the girls, and the suspect walks out with JC, it seemed to take a bit of time for them to walk them out, so perhaps the females left and they acted slightly on what was building all night. They go back up, hang out a bit, kicking off their pants, guys tend to hang out in their undershorts...and say its time for some sleep. Now I do believe the Jeff was the sugar daddy of the suspect. Why a separate apt? Because he does not want to be open about it, and he dates females that might not be comfortable about it, he wants his cake and eat it too, and he can afford it. So, I think that the suspects were more then friends. I think while suspect one is Jeff's boy toy, he allows him to have freedom as long as he is there at his beck and call. So....Suspect one and Suspect two have a relationship as well, for partying, doing stuff young guys do, friends with benefits. Fast forward, they all kick back to go to sleep. At this time the second suspect takes the opportunity once he knows his partner is asleep to advance on JC...a welcomed advance. But Suspect one wakes up, sees what is happening and between the drugs, drinking, and jealousy he attacks JC killing him with overkill. Now its up to suspect two to assist his friend and partner to clean up and dispose of the body. He feels guilty and obligated. They talk, figure out a plan and stumble through it. This is all just how I see it in my head, I am probably wrong, but I cannot help but feel this was a crime of passion. JMHO