No. FFs. It's how good you can become in a game and to what extent you can distinguish yourself from your peers.
Just an example. If we take a random game with a high skill ceiling. We take the top 1000 players. The top 100 will be better than the 100 below them and 101-200 will be better than the 201-300 below them and so on. If we pretend it's a 1v1 game, matching someone from 1-100 against anyone below will result in them winning 80%+ of the time. This will be true for all players 1-1000 matching them against an opponent in any division below them.
Now lets make this a low skill ceiling, still top 1000 but the skill ceiling is hit right about at rank 1000. Now any player 1-1000 playing against each other will have a ~50% win rate because they cant outplay/differentiate themselves from their peers.