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.

In The Lord of the Rings, why didn't Gandalf just destroy the ring in Orodruin when he had it for some time in Moria and later at Weathertop?

 In J.R.R. Tolkien's Middle-earth fantasy universe, the character Gandalf the Grey, a powerful wizard, has the opportunity to destroy the One Ring, a magical and powerful object that has the ability to dominate and enslave the inhabitants of Middle-earth, on several occasions throughout the story.

One reason why Gandalf does not simply destroy the ring when he has it in his possession is that he does not have the means to do so. The One Ring is indestructible by normal means, and it can only be destroyed by casting it into the fiery depths of the volcanic mountain of Orodruin, also known as Mount Doom, in the land of Mordor. This is the place where the ring was created, and it is the only place where it can be unmade.

Another reason why Gandalf does not destroy the ring is that he is not the one who is destined to do so. The task of destroying the ring is ultimately entrusted to the character Frodo Baggins, a hobbit who is chosen by the council of the wise to bear the ring to Mordor and cast it into the fire. Gandalf recognizes that Frodo is the one who has been chosen to fulfill this crucial role, and he supports and guides him on his journey to Mordor.

Overall, the reasons why Gandalf does not simply destroy the ring when he has the opportunity are that he does not have the means to do so and that he is not the one who is destined to fulfill this task.