No Pac won't land the type of shot that could stop Floyd if he cant do it to Marquez or Shane then he sure as hell cannot do it to Floyd. The only person recently he has stopped with one shot is Hatton, and he had a very porous defense I would expect Ortiz to have the bigger punch but I'm not sure either way.
Pac has hurt and dropped Marquez in the past. Again, Marquez just has the style to give Pac a nightmare each and every time. Now, PBF should do the same, but what if he got caught flush by Pac? Pac doesn't have to KO PBF. He just has to get his respect with a good shot and then we will have a decent fight. If not, Pac is going to get countered and peppered with pop shots all night. How hard does Ortiz punch, who knows. He only fought at WW twice and he fell asleep during the second fight.