I was lukewarm with the hiring of Vance Joseph. His coaching experience did not add up to head coaching potential.  Kyle Shanahan had just propelled Atlanta and Matt Ryan to a Super Bowl plus Denver needed an offensive coach after the last part of 2016. However, it did not happen so you move on.
Joseph appears to want to project as a decisive leader. In doing so he paints himself into a corner. If he has a QB that is stinking it up why not go another direction? If there is a left guard not making the cut make a change.  Those would be decisive changes that no one would argue against.  Instead, he sticks with previous statements, "Trevor will be our QB this year and we will stick with him".  If he is not performing why not make a change? He can always go back to him. The argument against this is he(Siemian) would lose his confidence pulling him like that.  He has confidence now?  Not liking the direction of this team and the confusing coaching decisions being made.