Dont think so. Pettis Kryptonite are swarmers / pressure fighters who close the distance fast ala RDA.
Diaz has the footwork of a sloth, he wont corner Pettis and he does not have the wrestling game to make it a dirty clinch fight.
Diaz always wants to get into a mid to long distance brawling game and then tries to outchin, cardio his opponents 1-2. If Pettis kicking game is on point he will loose what mobility is left and then he is like a sitting duck for Pettis to kill. Pettis has the faster hands, more punch, more ways to attack and especially faster footwork.
The only downfall imo could be a bad cardio otherwise he will make the win look easy and show Diaz for what he is. A middle of the road fighter for years now.
Funny how every point you made turned out to be the exact opposite in the fight.