I think Gjert learning the craft came from mistakes/experiments at his first go with Henrik, then Filip. Totally plausible.
An immensely talented trio , i get the feeling, consent came easier with Jakob than henrik and much less filip. I often wonder , if it were just Jakob, how successful would he have become?
Coe was coached by his engineer father on his own and had absolute consent from Seb.
Gjert and Peter are absolute methodical thinkers and were heavily invested, that's a rare combo. It will be interesting to see how jakob goes, with out the presence of his dad/coach and hope Henrik assumes duties