Memo played almost all his minutes at the 5; he was a center. As for Eaton, yes, he did play in a different era. The game was more physical. The 3pt shot was less of a weapon when he played and more of a novelty.
I think we undervalue Eaton's impact. He changed the game as well. The Jazz' strategy was to funnel everything to the middle so Eaton could block or punish players trying to drive inside. Eaton was a better shot-blocker than Gobert.
However, in today's game, Gobert often switchers on screens. A few games ago he switched onto the PG a few times and held his own. He is light years ahead of Memo on defense, but Memo was light years ahead on offense. I'd rate him ahead of Eaton defensively, although it's close.
It's only longevity that puts him outside of those two - and any others - in terms of overall stats.
How many shots would Rudy blocks in Eaton's era where players didnt shoot as many shots away from teh basket? At least 5 a game I'd think.