Freddie knows the girl and reade from the outside or prison.

Both owe him favors.

He tells homegirl to get some impressionable dweeb high/passed out and take him to her crib
He tells Reade to kill the girl in the crib while dude is passed out.
Hell, maybe Bodie is in on it too which would explain why he said he was alone and wouldn't give any info about what he was doing there(doesn't explain him giving up reade to stone except to try to save himself)

The only coincidence is shorty running into Naz but that is a coincidence regardless lol