The problem with Mercedes is her physical strength and aggressiveness. She doesn't look to score instinctively yet. She'll definitely take time to develop
That's an excellent observation. I know you probably don't read the BY religiously, but when Tenn landed Russell, some of us on here noted that she never really dominated any of the "all star" teams she played on. Most of the time on the USA National teams, she was the #3 or below leading scorer, and also didn't even lead the team in rebounds. For an athletic 6'6" kid who was top 3 in her class, it wasn't a ringing endorsement for her talent as the next great one.
Compare what she did internationally against kids like Stewie or KML or Williams, or even A'ja Wilson. Additionally, those of us who discussed Russell at the time also noted that generally it takes post players several years to develop. Look at a player like Tina Charles - she always put up strong numbers, but wasn't really a complete player or a monster till her junior year. Griner had to get stronger to handle the much more physical game in college. Still, Griner averaged over 18 PPG as a freshman and never played under 30 minutes as an average for ANY season.
I always said Russell would be a good player, but unless she developed a much better game, wouldn't be a great one. When you look at top 2-3 kids coming out of HS - those rated highest by the services, there are players like Parker, Charles, Moore, Taurasi, Griner, Simms, Ogwumike, Stewart, Williams, KML, Jefferson, EDD, Diggins, Jones (Alexis), Loyd, etc. who are at the top in HS, and are among the best in college.
There are players who are sort of in-between. Strother comes to mind - #1 coming out of HS and certainly did very very well at UCONN, but certainly not in the same class as Augustus who I think was #2 that year.
And then there are top 3 type players such as Ash Robinson, Sykes, Bjorkland, Bone, Howard (Natasha), Burdick, and others who are near the top in HS, but never really dominate at the same level in college. It remains to be seen if Russell will develop into the former or the latter.