Kelsey isn't a good defender because she's not a good defender. It ain't just because of size. That dog doesn't hunt. That's an insult to any quality defensive player that was a little undersized, and there have been thousands in basketball over the years. Without being close to the Fever, or caring to be BTW, I'm betting the demands aren't there defensively as a team under the current coach.
No single player can carry a basketball team to a championship. You have to have the coaching, the system and a great supporting cast. That goes for MJ, Shaq, Kobe, Hakeem or anyone.
MJ couldn't carry the Bulls to a championship vs. the experienced Celtics or Pistons early in his career - and was very clearly the best and most dominant player on the court. The Bulls had to put everything in place to make it happen, and grow as a team and individual players with the correct coach. And he's the best ever.
Steph Curry couldn't have carried to GS Warriors to a title without Klay and Draymond. Because no single player can.
Who knows what will happen in all these players careers. Some of it is out their hands, and in the hands of management and coaching. If a very good player doesn't have those pieces in pro sports... they are up against it.
I always reference VY at Texas in that regard at the college level. If Mack and Greg Davis hadn't opened their mind to what they needed to do offensively to maximize Texas with VY, and maximize VY at the same time ... there is zero chance Texas wins an NC with Vince, as truly talented as that team was. What a shame that would have been.