This is what is so annoying about you. We can't just talk about the historic significance of a threepeat without you making it some LeBron-centered bullshit.
Don't even address this part and let's stick to the real topic please:
You undermine your argument about 2000-03 with your attack on the 90s as well.
If you would dismiss a Shaq threepeat against prime Ewing, Olajuwon and Robinson, then the names of the centers he did it against don't really matter.
My main response is that I think Shaq would have been equally dominant in ANY prior era. If you put them against any prior dynasty, they'd have success. Put them in the league at the time of one of Jordan's threepeats), probably neither team shuts the other out and it is a question of who wins two out of three like the Celtics and Lakers from 2007-2010. In terms of individual performance, Shaq would be Shaq.