Entry matters too. You can't compare a person that invested in Bitcoin at $60K to a person that bought today at $63k, the difference is not that much until you compare the price and quantity you could get with that $3k differences and it's still better than a person that bought at $120, this one difference is so clear that you can get 1.4x the amount if you buy today. However, this is not guarantee, you time in the market and when you have the money to buy is the real deal.
From the illustration you gave i will say that someone who invested when the price was $60k and $63k is not the same but it is just a minor profit that someone who invested at $60k will get against the other person who invested at $63k. Someone who bought when the price was $120k will have to wait till the price of bitcoin has reached $240k before he can make x2 of his investment while someone who invested at a price of $60k will get double of their investment when the price hit $120k which is the entry point of the other person. When there is a DIP, it simply means that a time to buy more Bitcoins has arrived so it is to maximise one's profit.
