Actually, if the path is investment, of course the capital specifically to run the investment must be there and prepared from the start so that it can be used immediately for that, especially if what you want to buy is Bitcoin where investors will be much better if they can buy it earlier. And for smart investors, I think they will make their own sorting of their money when they want to do something bigger in the long term such as investing in Bitcoin so that the funds that are sorted will really be used for one purpose only and will not be mixed with others because other sectors are also prepared specifically by themselves.
To start your investment, you must have capital but you can start with a small investment capital, and expand it bigger and bigger with time. It's unnecessary to have very big capital that is used for your investment in one purchase or DCA practice.
DCA is a very good strategy by eliminate considerable initial investment capital by allowing you to make your Bitcoin accumulation with time comfortably without much pressure. They can simply work, get money and use part of it - that can be majority or minority of it - for their Bitcoin DCA over time. If they are more intensively in accumulation, they would use the majority of their income for Bitcoin accumulation. Otherwise, they would assign the minority of income to Bitcoin investment over time. Anyway, if they can do DCA with time and maintain it for a long time, it's good for their investment portfolio.