One difference I noticed between JP and DB, is JP's play fake is much better.  While it seems inconsequential, it can have a significant impact.  Think Peyton Manning, probably the best at it.  He's so good I can't tell sometimes whether he kept the ball or gave it to James.  Many of those play fakes ended up as Marvin H TDs... 
  
DB's fake was terrible.  JP's is pretty good.