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 language did the Dacians speak? Is there any evidence of it still existing today?

 The Dacians were an ancient people who lived in what is now modern-day Romania. The language spoken by the Dacians is believed to have been a form of Thracian, which was a branch of the Indo-European language family. However, very little is known about the Dacian language, as there are only a few fragments of written texts that have survived to the present day.

There is no evidence that the Dacian language is still spoken today, as the Dacians were assimilated into other cultures and their language disappeared over time. However, some scholars have suggested that certain words and phrases from the Dacian language may have survived in the modern Romanian language, which is spoken in Romania and other parts of Eastern Europe.

Overall, the Dacian language is a largely unknown and extinct language that has not been widely studied by linguists. However, some research has been done on the few surviving texts and artifacts, and this has provided some insights into the language and culture of the Dacians.