I wasn't referring to compounding the upfront money. That's nothing in Tatis' equation, or the OTE players' equations.
My point was if he developed faster as a player, due to the program they put him on, and he earned a BIG contract earlier (like $340 Million over 14 years big) than he otherwise might have (age 22 instead of 25 for example) the much higher early earnings (even after paying a % to the agency) could compound over his lifetime to a higher overall net. I thought I saw he referenced that point but maybe I read it wrong.
Here's a quote from one of the stories about his new contract, "Tatis landed in San Diego in 2016 in the now-fabled deal that sent James Shields to the White Sox. An unheralded prospect at the time, Tatis quickly became one of the sport’s best young talents." Did he do it all on his own or did the help he got make him that great a player in only 4 years?
It's all hypothetical because we don't know the percentage he agreed to or the other contract provisions, but that was my point.