Investment is not always the way we think it is. Yeah investment differs, it could be that a person just started investing aggressively consistently today or 2 years ago or like 2 years now and have a lesser amount of btc while in other words another person who invested in bitcoin 9 - 10 years ago may have accumulated $100 DCA each week in a year or $2k lump sum at ago and stop. Certainly the person who accumulated for that one years period will be advantaged than the person who tend to be aggressively buying bitcoin today or 2 years from now. Because that person that bought bitcoin during 2014/2013 would have gotten upto 10 to 12 btc with just a consistent investment of 1 year. Likewise a person who investes agresively in a period of 2 years from now will be advantaged in the next 10years to come. The slogan is the earlier the better
On a normal, those who started their investment 10 years ago would be at more advantage than people who's been investing two years from now, the price of Bitcoin was way cheaper back then and the current price has gone far beyond double the price when they invested and even though they just invested continuesly for just 1 to 2 years and stopped, so far they held till this period it's certain for them to make figures of 10 to 12 btc or even more than you mentioned, the only difference is if the other person who's been investing 2 years from now is very wealthy to buy the lumpsum of more than 10 to 12 btc but not much Bitcoin investors do that lately. Well, the slogan
the earlier the better is a very good one based on the advantage the investors stand gain in future when the price goes higher, just like those who invested 10 years back and hold are benefiting currently but then it's not just about investing earlier but holding for a very long-term cause if those people who bought and hold 10 years back had taken their profits in recent times, then I don't think they'll be having up to 10 to 12 btc expect maybe they continue accumulating after a while within that 10 years interval. In conclusion, the main point is buying and holding for long-term and not who has more advantages or more btc than who.