The Messi versus Ronaldo question is closed. We covered why in the piece on the debate that ended in 2023. The aggregate settled it, the internet kept arguing, and that gap between the math and the noise is the entire reason this series exists.
But closing that question opens a worse one. If Messi is the best of his era, and his era is the best-documented era in football history, then the real argument is the one nobody can resolve cleanly. Messi, Maradona, Pelé. Three players, three eras, three completely different kinds of evidence. The algorithm that settled the first question hits its limits on the second one, and the honest move is to say so.
Why the data does not transfer
The goal-difficulty methodology needs inputs measured at the moment of contact. Shot location to the foot. Defenders within three yards. Keeper position off the line. Ball movement at strike. For goals scored after roughly 2010, that data exists or can be reconstructed from broadcast footage and tracking.
For Maradona, the footage exists but the tracking does not, and the broadcast angles are too limited to reconstruct defensive pressure reliably. For Pelé, large portions of his career were either not filmed, filmed partially, or filmed from a single fixed camera that cannot establish the variables the methodology depends on.
This is not a small gap. It is the gap. Anyone who tells you they have objectively ranked Pelé against Messi is either guessing or hiding their assumptions. The data to do it does not exist, and no amount of model sophistication manufactures evidence that was never recorded.
What the methodology can still say
It can say something narrow and defensible. For the goals that are well-documented, Maradona's solo goal against England in 1986 is one of the highest-difficulty goals ever filmed. Sixty yards, eleven touches, five defenders engaged, finished at a tight angle against a committed keeper. It survives the analysis.
It can also say that the goal's mythology slightly exceeds its difficulty. The defenders he beat were backpedaling, not closing. That does not diminish the goal. It contextualizes it next to Messi's 2007 Copa del Rey run, which covered similar ground against defenders who were closing harder. Both goals are extraordinary. The Messi goal is marginally harder by the inputs that can be measured.
That is the limit of what the data supports. Everything past it is judgment.
The three honest positions
There are three defensible answers to the upstream question, and the difference between them is not data. It is what you decide greatness means.
If greatness means peak difficulty under measurable pressure, Messi wins, because his catalogue is the only one that can be fully measured and it is enormous. If greatness means dominance relative to the gap between you and everyone else alive at the time, Pelé has the strongest claim. If greatness means carrying a worse supporting cast to the sport's highest prize through individual moments, Maradona has the claim.
The methodology picks the first answer because the first answer is the one it is built to measure. That is not the same as the first answer being correct. A model that can only measure one era will always favor that era. Honesty about that bias is more valuable than pretending it is not there.
Where this leaves the debate
The Messi versus Ronaldo debate was the warm-up because it was answerable. Both players were measured by the same instruments under the same conditions. The instruments returned a verdict.
The Messi versus Maradona versus Pelé debate is not answerable by instruments, because the instruments did not exist for two of the three. What the methodology offers here is not an answer. It is a clear statement of which parts of the question are empirical and which parts are values.