You are viewing these players are robots, not human beings. This isn't a video game where you just try to assemble a team of players with the highest rating. The pieces have to fit together off the court as much as they do on the court.
All of the kids on this team are friends and have a special bond. They have been teammates for 2+ years, gone through a coaching change and multiple losing seasons. They have been through a lot of crap together, which has definitely strengthened that bond.
We have had winning teams with serious deficiencies on the roster. The 2012-2013 team is a perfect example. They had great season, not because of their talent, but because of the bond they had off the court. They played with and for each other each and every game.
Forcing a kid out, regardless of his talent level, will have a negative impact on the rest of the team and the culture Hurley is trying to build. The players you are speaking about kicking out are not standing in the way of any "top performer" getting minutes, Hurley has made that clear. I don't think a single player on the team would be happy if Hurley kicked someone out purely because of their talent between the lines.
Edit: BTW, I'm not arguing that 2 scholarships would be bad by any means. I'd love if we had more scholarships open-up. I'm just saying if we open another scholarship it needs to come about organically and from the players choice, not by throwing "dead wight" to the wolves.