Bowerman used the word homicide so it would seem that he believes DeOrr is deceased....he has access to all the evidence but is much more tight-lipped than Klein.
Bowerman says this:
(Quote)
“We have no credible witness at this time that can clearly state that (DeOrr) was at the scene,” Bowerman told Bloom. “Not only am I not believing he was ever there, but I’m believing that we have a homicide.”
http://www.eastidahonews.com/2016/07/sheriff-deorrs-disappearance-moving-towards-homicide/
It would seem from this statement of Bowerman's that he is thinking homicide because there aren't any credible witnesses that place Deorr at the scene.
He doesn't actually state that because of evidence gathered from the scene that he thinks Deorr is deceased. All IMO.