I don't think Hibbert will ever reach Okafor's level. Okafor is a strong defender and a good rebounder. He's strong as an oxe and has the traits to be a very good veteran leader. Hibbert's goal should be Rasho Nesterovic.
I think Hibbert could be better offensively than Okafor, but Okafor is simply more agile and athletic than Hibbert. I think there are many times when Hibbert can't be on the floor, like when the team is playing a small. Okafor can still keep up. Hibbert can't.