With all due respect, I think there is an impulsive component with psychopaths. I am not sure all murderers are psychopaths but I do believe that this psychopath seized an opportunity.
I don't imagine he planned it but when the opportunity came up I cannot rule out murder. IMO, it wasn't a plan as much as manipulating the time and the place for the next logical step(s).
At this point - I am not sure when the thought train left the station.
For 12(?)years HK$ glommed on to ANS in the belief that at some point he would participate in getting the Marshall money.
HK$ clung to her in spite of the differences in social background etc., He took the insults to his manhood with ANS’ multiple sexual partners and obviously had little or no influence on her at the beginning of their association.
Then, at some point, probably the LB pregnancy (as in the Mark Hatten crisis) HK$ realized he might be pushed out by Birkhead or by Daniel. He was able to influence the demise of Larry and the only solution for dispatching Daniel was a lot more complicated.
Then the problem was that ANS knew how and why Daniel was dead. Further planning took from September 06 to Feb 07 - five months, during which time ANS was completely controlled by drugs - all nice and legally prescribed by an MD.