There's a big difference between "Most teams have at least one cs player" and "85% of all players are from CS"
Let's go through the recent successful rosters
2023 Fnatic
Boaster and Derke played CS professionally; Leo, Alfa and Chron did not.
2023 EG
C0m and Ethan played CS; jawg, Demon1 and Boostio did not
2024 Sentinels
Zellsis and TenZ played CS; Sacy, zekken did not. Johnqt apparently has like 27 maps on record, so not really, but let's count him.
Let's throw the current top 4 at Shanghai in as well to get some more data
G2
JonahP, leaf yes; trent, icy, valyn no
GenG
Lakia yes; Meteor, Karon, t3xture, Munchkin no
100T (excl Boostio because I already counted him above)
None of them as far as I can tell
TH
Pati yes; Benjy, wo0t, Riens, MiniBoo no. Boo also has a couple of matches for some teams that as far as I can tell aren't even salaried ors, but let's be generous and count him as well.
That's a sample size of 35 players, and only 12 of them played CS professionally. That's less than half. And the number is getting smaller and smaller every year. All the rising stars like Benjy, N4rrate and whatnot do not have CS careers.
Yeah early Valorant built its esports on the back of former CS pros, but those times are over. The only ex-CS players that are successful in Valorant are the ones that switched early (2020-21) and have fully focused on Valorant for years.