That might have been your point, but you made it badly pointing to 1 player who failed to make the crossover long term when replying to someone who said they were very different sports making it look like you agree with their point.
You would have been better off pointing to players who had...
Sonny Bill Williams has played both after starting in League, Jason Robinson also started in League, both won World Cups as Union players. There are plenty of players who've crossed codes.