Exactly.
For an example, we had 4 guys bumped from 4.5 to 5.0 from our 40 and Over Nationals team last year. One guy was our 4.5 singles specialist who is 56 years old, weighs about 150 lbs, and runs marathons for fun. I wouldn't call him a pusher, but he doesn't really have any weapons, and he wins with hustle and extreme consistency. One of the other guys is in his mid-40s and is also in really good shape - no weapons again, but is clutch under pressure and is one of those amiable guys that can play anywhere (singles or doubles with anyone on the team). The other two players that were a doubles team in their mid-40s that just clicked together - individually, they are decent 4.5s (not really singles players though) but as a doubles team they were rock solid and won a ton of big matches. All 4 of these guys are borderline, sitting in that grey area at the top of 4.5 and the bottom of 5.0 - with enough fitness and consistency to win a lot at 4.5, but not enough power or weapons to win much at 5.0. When they played 5.0 league at the beginning of this year before the shutdown, they had a collective 4-11 record between them, with all 4 of the wins they had coming against 4.5 players that were playing up on a 5.0 team. And there is a massive difference between these guys and a solid 5.0 in their 20s or early 30s that can crush the ball.