They had to play as many matches as their competition. You make it sound like only Bill Russell enjoyed those perks. Everyone in the league did, and he made the best out of it.
That's why comparing cross-eras is stupid anyway.
What you should compare is how well a person did in their era. And nobody did as well as Bill Russell. xD
Also, even if you do the eye-test, you'll see how much of a monster that guy was.
Bill Russell jumps OVER a guy from near the FT Line - INSANE speed and hang time! - YouTube
A center, running with the ball like a guard, took off from near the free-throw line, and jumped over a guy (literally). lol
And you can make arguments that lower his greatness based on his era, but you could also do the opposite. Imagine how much of a monster that guy would be if he COULD focus only on basketball, and if he had all of today's nutrition and athletics specialists and coaches at his disposal lol. LeBron James enjoys a lot of modern perks that Bill Russell didn't have back in the day, and he was still jumping over people from the free throw line.
Anyway, your turn to pick, then Ichi. xD