Grandpa Race had a really interesting post about the GOATs that really spell out how the eras of the game really have an influence of what dominance in that time period looks like. It's also a good example of how given how the game has evolved over time that comparing across eras can be problematic.
Ultimately, how you rank players is really dependent upon what you value the most. At this point I think any top 5 that doesn't include some combination of MJ, Russell, Kareem, Magic, and LBJ is probably missing the mark a bit but I'm always open to good arguments.
There's been a lot made about Russell over time and how he performed versus Wilt. But that's not the most impressive thing to me about Russell ... it's what he did in games for championships and particularly Game 7's (and remember that Russell's career per game averages were 15.1 points, 22.5 rebounds, and 4.3 assists).
1957: Game 7 vs St Louis Hawks ... Boston wins 125-123 in 2OT ... Russell's stat line = 19 points (7 of 17 shooting) and 32 rebounds while playing 54 of the 58 minutes ... important to keep in mind that shooting for the game was a collective3 37%.
1958: Russell injured with a severe ankle sprain in the Finals and the Celtics lost
1959: Celtics sweep Lakers ... Russell with 15 and 30 in the deciding game
1960: Celtics beat St Louis in 7 ... Russell with 22 and 35
1961: Celtics beat St Louis in 5 ... Russell with 30 and 38 in the clinching game
1962: Celtics beat the Lakers in 7 with the deciding game in OT ... Russell plays every minute and finishes with 30 points and 40 rebounds
1963: Celtics beat the Lakers again in 6 ... played every minute and finished with 12 points, 24 rebounds, and 9 assists ... Celtics win by 3
1964: Celtics beat the Warriors in 5 … Russell with a tidy 14 point, 26 rebound, 6 assist line while more importantly "holding" Wilt to 30 points on 12 of 28 shooting (note that Wilt averaged 36.9 points per game on the season and in the series only 29.2 points per game)
1965: Celtics beat the Lakers in 5 … in a blowout, Russell finishes with 22 points (on 6 of 9 shooting and 10 of 11 from the line), 30 rebounds, and 4 assists. Ho hum. More impressively was Game 7 in the East again against Wilt where in a 1 point win, Russell played every minute and finished with a 15-29-8 stat line.
1966: Celtics beat the Lakers in 7 … they win Game 7 by 2 with Russell playing every minute, scores 25 and adds 32 boards.
1967: Celtics destroyed in 5 by one of the great teams of all time in a 68 win 76ers team … Russell's really only non-descript game in his career in a clinching or elimination game (without injury impacting him)
1968: Celtics beat the Lakers in 6 … Russell with a 12-19-6 stat line on 5 of 7 shooting.
1969: Celtics beat the Lakers in 7 … in his last professional game, Russell plays every minute, and finishes with 6 points, 21 boards, and 6 assists (a team high).
When it mattered, Russell almost ALWAYS elevated his game ... that's what being a great means.