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.

What are some of the unsolved mysteries of history?

 There are many unsolved mysteries in history, and new discoveries and research are constantly shedding light on these mysteries. Some of the most famous unsolved mysteries of history include:

The disappearance of the Roanoke Colony: In 1587, a group of English settlers arrived on Roanoke Island, in present-day North Carolina, to establish a colony. The following year, the colony's governor returned to England for supplies, and when he returned, he found the colony abandoned, with no sign of the settlers. The fate of the "Lost Colony" of Roanoke remains one of the great mysteries of history.

The curse of the pharaohs: In ancient Egypt, pharaohs were buried with great riches and elaborate tombs, and it was believed that anyone who disturbed a pharaoh's tomb would be cursed. Despite this belief, many tombs were looted and vandalized over the centuries, but some pharaohs' tombs remain untouched to this day. This has led to speculation about the possible existence of a curse that protects these tombs from looters.

The Voynich Manuscript: The Voynich Manuscript is an ancient book that was discovered in the early 20th century. The book is written in an unknown script and contains strange illustrations, but no one has been able to decipher its meaning. The book has been studied by many experts, but its origins and purpose remain a mystery.

The Bermuda Triangle: The Bermuda Triangle is an area in the western part of the North Atlantic Ocean, bounded by Miami, Bermuda, and Puerto Rico. The area has been the site of many unexplained shipwrecks and aircraft disappearances, which have led to speculation about the existence of a "Bermuda Triangle" curse or other supernatural forces.

These are just a few examples of the many unsolved mysteries of history. There are many more mysteries that continue to fascinate historians and researchers around the world.