Biggest mistake on future Pacquiao opponents can make?

They'll directly go and study the Pacquiao Vs. Marquez fight!Lol! In my opinion Pacquaio I saw an improvement on Pacquiao when he fought Diaz.Aside from throwin' punches in bunches in different angles, his defenses have improved and his footwork also but most of all he fights more relaxed inside the ring and his timing gotten' better.