Which fallacy is illustrated when assuming that because one athlete is great, their teammate must also be great?

The fallacy in question illustrates the concept of Composition. This fallacy occurs when an argument incorrectly attributes the characteristics of a part or individual to the whole or group they belong to. In this case, if one athlete is outstanding, it does not logically follow that all teammates, or the team as a whole, share the same level of excellence or skill.

It reflects a misunderstanding of how individual performance relates to group dynamics. Just because one member excels does not guarantee that every member possesses the same abilities or qualities. This line of reasoning overlooks the variety of skills and levels of performance found within a team, leading to an erroneous conclusion about the overall capability of the group based solely on an individual’s success.