kinda strange when investing in a volitile market. you can spend 10,000 $ into the market in january and come out less. than what a person invested in april with 10,000 $.
A real investment would take affect in term of years, decades.
Its only 7, 8 months, we cant say anything about that person's investments.
But its right that a good entry can determine the success of an investment. You may not buy the dip; close to the dip would already be decent.