If Sloter had something tremendous to show that suggested he should be the starting QB against the Chargers on opening night, they'd have been seeing signs of it in OTAs and training camp.  They see these guys every day.  We (as fans) have only seen Sloter for the 4th quarter of one preseason game.  The team has 30x more info to go by than we do.  

Trevor's played 14 games in the NFL.  People talk about upside for Sloter, or for Lynch, or for Chad Kelly, but they act like Trevor has no further upside.  14 games (basically one season) is still not that much experience.  Very few NFL QBs play great in their first season of play.  Trevor's 1st-year stats actually compare pretty well to other notable QBs that developed into excellent QBs by their 2nd or 3rd year starting.  Only time will tell if that happens with Trevor, but the suggestion that he's already "topped out" after 14 starts is kinda silly.