The way NA handle coaching in pretty much every esport i follow is one of the main reasons why NA keeps being behind EU, KR etc.
While the coach in the best EU teams also tends to be the actual leader of the team, with authority and power, the coaches in NA usually get used like a analyst+. The Coach, in the mind of NA pros, should only talk when asked and give important information about their enemys like a robot. The thing is, especially SEN needs somebody who takes over the sterring wheel, and is willing to cut people who do not want to win over anything else.
The same thing always happened in CS for example. The Coaches that were thrown around in the NA scene were always these quiet analyst type guys (AdreN, Imapet etc...) Meanwhile the best teams always gave the authority to the Coach, like Astralis Zonic, Gambit with Groove, NaVi with Bl4d3 or Vitality with XQTZZ. This way of running a team is proven to be much better and we already saw that with the Guard who adopted that european coaching style.