Not really. Since you disagree with my opinion on him, how about the opinion of someone who watched every game he played in Dallas?
Darren Collison -
He is actually my vote for worst defensive player for Dallas. Collison may seem like a decent defender just because he manages to get a good number of steals, but if you focus on his defense for stretches of games you'll see why I feel this way. When covering the ball handler he usually has no idea where a screen is coming from, which is odd considering his teammates announce them. Even without screens Collison has trouble staying in front of offensive players, getting taken to the paint with annoying regularity. In terms of help defense, he makes the wrong rotation A LOT. I've seen instances of Shawn Marion pushing him towards the correct rotation after making the wrong one. That sort of thing shows a misunderstanding of the Dallas defensive scheme as well as a lack of faith in the rotations of his teammates. Some of this poor defense is related to not having a solid rim protector, because as I've stated defense is a team effort. He should still be much better than he is, considering his speed and quickness.
http://www.mavsmoneyball.com/2013/4/11/4212656/in-their-defense-the-problematic-dallas-defenders
It's pretty spot on. He's a gambler, will get you steals, pressure up towards half court, but is fundamentally a poor defender in a half court setting when guarding 1v1 and dealing with picks/switches/rotations.
It's part of the reason Dallas didn't want him back. It's also part of the reason Indiana replaced him with George Hill as a starter heading into the playoffs, then traded him to Dallas.
As far as Ray, he doesn't appear to even be in the guard rotation with the signing of Sessions.
Most guards who are "lauded" for the defense don't play for 5 teams in their first 6 years, btw.