I don't know about that. He is able to give us a good 10-15 minutes a game but the other 10-15 minutes aren't so good. If he was playing as a real backup then he could be pulled for the starter or someone else if he's playing like garbage or doing stupid things. Right now he's coming off the bench but isn't the true backup PG. He's the only point guard, really. I could see him in more of a backup role later in the season if Kokoskov keeps this starting group and starts giving Okobo or Melton more time. I wonder why they're not seeing more time, especially Okobo, because he looks good when he is out there. Both have played some in the G-League also. There is no reason to sit them like Kokoskov has. One should always be in the G-League and the other should see 3-4 minutes in the first half, at least, and if they are good minutes then extend them and give them some in the second half.
Back to the original point though, Canaan should be a decent backup when there is a real PG for him to backup. Right now he's more of a sixth man or something and doesn't have another PG challenging him for playing time and I think that has given him more room to make mistakes, for better and worse. Mostly worse but as Steve pointed out, sometimes it's helped like in the Spurs game.