From earlier research Santamaria was a classic sweeper not a libero. I'd put him stylistically closer to Picchi than Baresi/Figueroa. He was the last man on the line and played the deepest as final line of defence. He was a big strong lad, but what made him special was the technical ability, positional and game reading intelligence and leadership.
Bergomi was known more for his tenacious style and a reputed man marker. He was no mug on the ball, but I'd still lean more towards stopper than a sweeper.