When Perk gets back, we may very well have the best 5 man big rotation in history. I know they are not all exactly in their prime or really 100% healthy, but overall and with sensible time management they will be scary next year. 
Any four man big rotation from our 80's Celts would kill these guys, but it is very exciting to have 3 legit centers, plus KG and Baby.
I'd probably take prime Shaq and Prime KG over absolutely anyone else you could ever offer. The havoc those two would reak just couldn't be topped.
Me too. They are old now but Shaq and KG in their primes would maybe be untoppable as a 4/5 combo.
And "kill" is a very strong word to use in matching them up against the 80's guys. And if we're taking them all late in their careers I might take our current guys. In the hypothetical primes, KG and Shaq and Jermaine O'Neal off the bench would kill anyone inside.