Our best Center might be the least athletic player around the league (at least in terms of lateral quicks).
Hayward isn't overly athletic either (to say the least).
TIMELORD, Jaylen, Green, are all freak athletes.
Check this out. It's Bill Russell jumping over a guy nearly from the free throw line!
https://www.youtube.com/watch?v=JWelUNrJUMMAnd that was in the 50s/60s with crappy shoes on. Imagine Russell today! He would jump out the gym.
Timelord is a great athlete, but if we are talking about the most athletic team of all time, he ain't Bill Russell.
For the record, Russell was also a standout in track and field events. He was ranked the seventh-best high-jumper in the world in 1956 (his graduation year) despite not competing in Olympic high-jump competition that year.
If anyone's interested, here are a few more Bill Russell vids.
https://backpicks.com/2018/04/02/backpicks-goat-3-bill-russell/Anyway, of the 3 players you mentioned, only Brown is considered a regular starter. Green has started zero games and is averaging 6.9 mins per game. Timelord has started 1 game and he's averaging 15.3 mins per game.
Hayward on the other hand is a surefire starter. Kanter is playing plenty of minutes as well. He might even be a starter come playoff time (probably not but you never know). Most athletic Celtics team of all time? Nah, I don't buy it.