Do you think the hit team would have proceeded if they weren't 100% sure that LBJ had their back?
This has got nothing to do with what we're talking about.
The probability is that whoever did this were "foot soldiers", completely ignorant about where their orders were ultimately coming from.
They most certainly had nothing to do with LBJ.
We're talking about setting up someone for the shooting.
The storyline of the set up is that the shooter is an employee of the TSBD and is taking the shots from the TSBD.
How is this set up going to work if people are firing from anywhere other than the TSBD?