In the novelization it's cut clear: Dooku doesn't hold back. And if Obi-wan could have defeated Vader, he would have.
Now, we KNOW the SKywalkers have become living conduits of the Force, drawing power from every thing in the galaxy, we know Jacen became an avatar of the Force and Anakin. Would Lucas count as proof? He's confirmed everything on the OT DVDs. How many other families were actually given birth by the Force with an ancestor who was almost a manifestation of himself? According to the Journal of the Whills and all...It was unprecedented, in the entire history of the Order...and I don't see the force giving a boost to the Sith, which the Chosen One was created to destroy.
The Prophecy doesn't support Anakin>All in Raw potential. Story evidence and Lucas on the other hand, do. Commentaries and NEC, along with Rogue Planet and some other books as sources. We've seen the Skywalkers do things most people couldn't dream of.