Aldridge is fundamental?
He doesn't box out, he doesn't have any consistent moves in the post (even basic ones like drop step, up n under, baseline spin), he doesn't consistently play the backboard offensively, he doesn't show his hands at all times offensively... The only truly special fundamental thing he has shown is his beautiful high release on his J.
In fact, the things Aldridge are excels at on each end are probably the weakest parts of Duncans all around incredible game, outside shooting, and covering smaller players on PnR switches. They are nothing alike.
Al Jefferson is a lot more like Timmy even with the horrible D. No one in recent memory abuses Timmy himself in the post than Big Al. He already has a wide array of posts moves, is a solid rebounder and like Timmy is deceptively strong. Someone mentioned Brook Lopez which was random but a good observation. The step through hook over his left shoulder is like a Tim Duncan clone.
Tim is hard to compare to because he is good at every aspect of the game, great a lot of aspects and a fantastic defender all whilst lacking in athleticism. It's like trying to compare someone to Larry Bird, you might find a couple of similarities but not a lot. LaMarcus Aldridge has absolutely nothing that resembles Tim Duncan.