This post is pure mental speculation. One might imagine PL Blake might have been spreading money around from the $50 million he was and is being paid in installments for his political/litigation efforts. One thinks a bit of the story line regarding the campaign lobbyist characters in John Grisham's The Appeal (2008).
In the Scruggs - Lackey matter it does not seem one could say that Mr. Blake was spreading money around.
Why? It is very simple. If he was spreading money around why would he have been involved in conversations in which the $40,000 Lackey requested bribe was to be paid by Scruggs? He would not have, he would have just paid it himself. But he didn't. And, any overtures by Balducci regarding the amount would not have involved Scruggs, but they did. Thus, by this event one could not say Mr. Blake was acting as a bagman.
But, one does wonder anew about the extent and customs of earwigging in Mississippi. Seems a bit reasonable.