I have some experience with the elastic effect.
Last season, I trained JS on 4 players.
22 Year old MVP popped every 2 weeks, without a doubt. Had high OD, DA, PA and DR.
21 Year old superstar popped ever 3-4 weeks in JS, had low handling, passing, driving in comparison to his OD/JS.
21 Year old per-allstar popped every 2 weeks, had high OD, PA and DR.
There's no plausible reason for my 21 year old superstar to pop ever 3-4 weeks, but because his other primary skills were less than half the ability of the MVP and Per-AS, it's no surprise he popped slower.