What, you mean Tunni does or doesn't do that massive pedalkick? He does in my opinion, all his gaps look like he's putting a lot of effort into them. You need to watch closely at how Marco Grosenik or TRA gap, they seem to have mastered that move. In answer to your question, you need to pinch gap and most important of all, jump forwards with the body and pull the bike with you, not the other way round (as in do a powerful pedalkick and expect the bike to propel you forward).