Ty Cobb stacked up with the Babe, the Babe Stacked up with Lou G., Lou G. stacked up with Jolting Joe, Jolting Joe stacked up with the Splendid Splinter, the Splendid Splinter stacked up with the Say Hey Kid, the Say Hey Kid stacked up with Reggie, Reggie stacked up with Mike Schmidt, Mike Schmidt staked up with Bonds, Bonds stacked up with Alex Rodriguez, Alex Rodriguez stacked up with Mike Trout.
All these stars mentioned 1st in each group were the equivalent of the new stars (mentioned second) that came in later in their careers. Does it mean Ty Cobb would be as good Mike Trout today, hardly, all it means is that guys who are good can compete (given the same rules) with the guys who came later in their careers who competed well with guys who came later in their careers, etc..
As Oscar once famously said (or maybe not but sounds good) when asked if he could beat Michael Jordon one on one, he pondered for a few seconds and said "I think so, but you know I'm almost 60 now".