I am not sure about the whole "he needs to have X amount of stars" thing, but having watched both Norton and Miller play here in Jacksonville, in person on a few occasions, I think Millers upside/potential is higher than Norton's. The local high school coaches agree and have said so on several occasions. Some big time coaches from big time programs like Jacksonville Raines, said that Miller is the most dominant DT that has come from Jacksonville in a very long time.
We will see how that pans out at Miami. But I will be more shocked than not, if Jess Simpson is not able to turn him into a good DT for us down the line.