I’m talking about equivalent times smart guy. his 9.72 was break through in his career. but it wasn’t that far out of the ordinary considering he was a sub 20 200 guy well into his youth. the 100m ended up being his best event and a 200m world record closer to 19 flat would’ve seemed more typical. He made these advancements while in his early twenties, peaked, plateaued then regressed. So yeah not literally linearly but yes linearly in respect to how an athlete may spike in performance when conditioning for a their prime event, which turns out was closer to the 100m than the 400m... I’m hesitant to give bolt the pass but he gets it for all those reasons.