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 is union density and how important is it?

 Union density refers to the percentage of workers in a given country or region who are members of a labor union. It is a measure of the prevalence of union membership in the workforce and can be used as an indicator of the strength and influence of unions within a society.

The importance of union density can vary depending on the context. In general, higher union density is often associated with higher wages and better working conditions for unionized workers. Unions can negotiate better pay and benefits for their members through collective bargaining, and they can also advocate for improvements to working conditions and job security. Higher union density can also lead to more balanced and equitable distribution of wealth and income within a society.

Union density can also be an important factor in shaping public policy and the overall political climate. Unions can use their collective power and influence to advocate for policies that support workers' rights and protections, and they can also play a role in shaping public opinion on various issues.

In some countries, union density is relatively high, while in others it is quite low. The level of union density can be influenced by a variety of factors, including the legal and regulatory environment, the strength of labor protections, and the economic and social conditions of a country or region.