Bird went to a team in 1979 that had two straight losing seasons and that was coming off a 29 win season. No Mchale, Parish, Johnson, Walton. An aging and past his prime Cowens. Took that team to 60 wins in an EC with a very, very good Sixers team, a very good Bucks team and a good San Antonio team. LeBron went to a bad Cavs team and could make the play-offs for his first two seasons.
I'm less interested in comparing a 23-year old Larry to a 19-year old LeBron (as you are doing here), and more interested in making the claim that the 25-year old LeBron is a better basketball player than any player since 1980 has ever been at any age.
See my above post on what a 20 year old Magic did in the playoffs his rookie year
And to add to the Magic-Larry mystique, what Magic did in the playoffs in that same 1980 year is unparalleled in the history of the NBA for a person at that age
At 20 years old while being a rookie, Magic averaged 18.3 PPG, 10.5 RPG, 9.3 APG, 3 STPG while shooting 51.8% in the playoffs and winning the Finals MVP while playing 5 different positions and ending with a 42 point explosion while playing center in the deciding game
This is after a regular season of 18 PPG, 7.7 RPG, 7.3 APG and 2.4 STPG while shooting 53% from the field
At 21 Magic put numbers of 21.6 PPG, 8.6 RPG, 8.6 APG, 3.4 STPG(led league) while shooting 53.2%
At 22 Magic put up numbers of 18.6 PPG, 9.6 RPG, 9.5 APG, 2.7 STPG(led league) while shooting 53.7% winning his second championship and 2nd Finals MVP while putting up numbers of 17.4 PPG, 11.3 RPG, 9.3 APG, 2.8 STPG while shooting 53% in the playoffs
At a similar age Magic was a much better player, accomplished a lot more and if he wanted to take as many shots as LeBron took, would have easily averaged more PPG than LeBron
LeBron isn't even as good as Magic, never mind MJ, Russell, Chamberlain, and others