Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

Did Plato and Aristotle study under Socrates?

 Yes, Plato and Aristotle both studied under Socrates. Plato was one of Socrates' most famous students and was deeply influenced by his teachings. Plato was a philosopher who is known for his dialogues, which often feature Socrates as a main character. These dialogues are considered some of the most important works of philosophy in the Western tradition and are a key source of information about Socrates' ideas and teachings.

Aristotle was another important student of Socrates. He studied under Socrates for several years in the late 400s BCE, and later became one of the most influential philosophers in the Western tradition. Aristotle's philosophy was heavily influenced by Socrates' ideas, as well as those of other Greek philosophers such as Plato.

Both Plato and Aristotle are considered to be important figures in the history of philosophy and have made significant contributions to the field. Their study under Socrates was a key factor in shaping their ideas and their approach to philosophy, and they both went on to have a lasting impact on the development of philosophical thought.