Sounds right.Yeah coaching was way less sophisticated than it was today. Rotations were not as important as your core players played way more often, and overall the tactics were just not that advanced compared to future generations. I believe that Havlicek was basically Russell's assistant, managing the offense while Sam Jones handled substitutions, and Russell ran the defense and did the typical game management stuff.
Not to take away from Russell's achievement. I'm sure that was still a nightmare managing egos, considering matchups and strategy, overall managing 12 guys in general, when he still had his own personal work to get in. But the minutes management and aggressive game-planning of specific actions is night and day different now than what folks did then. Russell's hands-on coaching work was probably closer to what an NFL head coach does today--game prep and halftime adjustments.