AGE — Raphinha is also 3 years older than Antony despite being on the similar level. So add 15-20m to Antony as he has more years to render his services.
POTENTIAL— At 25, Raphinha is more of a finished article. And you can safely assume he is not gonna grow and develop his game anymore whereas Antony just turned 22, is still growing and adding more to his game. At 25-26, he might be better than Raphinha or stay the same but because of that talent and potential factor, add 10-15m more.
RESALE VALUE - Raphinha just moving to Barca and turning 26 in December would have very little resale value after let’s say 4-5 yrs of service whereas Antony would be in his prime if he moved after 4-5 yrs. Add 15-20 m to the fee.
So after taking 3 main points into account and after evaluating them for the two said players, the logical inference is if Raphinha is 50m then Antony should be 40-55m more than him. And given United paid 80 for him which is 30m more , it can be said that got him for cheap or least at par with Raphinha’s value.
I think age 25 is actually at a very good age to maximize fee, as we’ve seen in the past, world record transfer is Neymar at 25.
And I wouldn’t say Antony has higher ceiling than Raphinha, even though he is 3 years younger. I have watched their game in Brazil shirts, they look almost identical in talent, with Raphinha look even more electrifying/impactful. Younger doesn’t necessarily means better talent, as Antony isn’t really some 18 year kid type of unpolished raw talent, although he could still improve his decision making and end products. But in terms of pace/trickery/skills/electrifying footwork, 22-23 is actually near the peak age.
Messi and Ronaldo at around 22-23 is at their Ballon D’or peak level. Mbappe or Haaland at 22-23 is already among top top player in the world. For trickery/skilful attacking winger, usually at around 22-27 would be their peak years.
Below is their game earlier this year in the same Brazil game, against same opponents, for comparison: