Does the time line support the possibility that Tracy Martin made the Serino claim after Shyster Crump briefed her?
The possibility exists, but note that Crump didn't need to be involved before the Martin family (and the father's girlfriend) were making inaccurate statements. For example, I the family's statement about Trayvon leaving to buy Skittles for his nephew at halftime of the NBA All-Star game was made before Crump got involved as far as I can tell (Martin was killed more than thirty minutes before tip-off of the All-Star Game, much less halftime). In addition, the father's girlfriend was interviewed on TV the day after the shooting claiming that Trayvon was just sitting on his porch when he was shot. I can find that clip if you want it badly.
Incidentally, I made a mistake with my use of the feminine pronoun. Tracy Martin was Trayvon Martin's father, not his mother.