Final answer:
Mr. Donatelli thinks Alfred is not cut out to be a boxer because he is old and tired, like the Late Classical image of Weary Herakles.
Step-by-step explanation:
Mr. Donatelli thinks that Alfred is not cut out to be a boxer because he is old and tired, much like the Late Classical image of a Weary Herakles. Donatello's sculpture shows the boxer as beaten and exhausted, with a swollen face, split lip, and cauliflowered ears. This portrayal suggests that the boxer is past his prime and no longer capable of competing at a high level.