I think Batum had a clear cut role for them that expanded as the season went on and injuries dictated. Jackson is very similar to Dunn imo... they had just brought on Kennard... still had Lou Will and Pat Bev. His minutes yo-yo'd at the beginning of the season as they were figuring out what worked. They thought they needed a floor general and even went out and added Rondo at the trade deadline... so RJ's role was not clear cut at all. They thought he might be useful, but it would have been reasonable to guess that he'd be out of the rotation at some point during the season if they were healthy. Very much like Dunn would be here.
Mann was a development surprise... but I use these guys as fringe roster additions that can change things for you. One of those types of moves isn't enough on its own... but as a whole they have a material effect on the season for sure. So when folks say "who cares player X is your 8th/9th man" it doesn't really work for me. Dunn might get mothballed like Rondo did... but he also might really help.
I agree with the overall assessment on Smart being better... definitely the preferred route from my perspective. I think Dunn could be a useful specialist because he is incredibly good at the thing he does well. If Butler isn't ready he'd be useful in managing the season and keeping DM, Mike, and Joe healthy through load management. If Quin doesn't have good options I don't see us willingly going into load management mode until it becomes injury management.
My line of thinking on Dunn is - If we are in the Clippers series and everything is going the way it was and the only thing that changed is we had a healthy Kris Dunn do I think Quin would use him? I do... Do I think it would matter? Yes I think it would. RJ was killing us... Dunn can help stem that tide. He might also be able to sneak in and disrupt some drives. He might have hurt us offensively but I might prefer him to Royce at times.
We've solved the frontcourt depth problems imo... the perimeter/guard depth issues are hopefully solved by Butler, Forrest, and decent health. Kind of a grab bag there. I agree Smart would be like a perfect solution theoretically. But I think Dunn is a really useful second option and if it only costs $7M extra I'd do it in a heart beat. Might be able to get a second rounder for your trouble. Boston may not make Smart available at all and if they did they might do better than JC.
If the Dunn acquisition had no impact it is either because he was hurt (that sucks) or because the team was healthy and/or Butler looks good... I think you'd be in a pretty good place if the latter is true. We need to make as many good bets as we can imo.
RJ was playing 20 MPG the instant he got to LAC. They had a role for him right away. They brought Kennard in the next summer, but IMO that's not the same as Dunn because they brought in someone different at the same/higher level. That's where the biggest difference lies for me. Dunn is on the fringes whereas Reggie Jackson was a well established starting PG (with a big contract to back it up). The Clippers were stacking their roster with proven rotation/starter caliber guys. Adding Dunn would be adding a player that's clearly below the players that are currently in the rotation. I don't believe he's close to Clarkson/Ingles, which is who he would have to take minutes from.
And again, I'm not saying players 10-15 don't matter or that it's not important. I just think it's significantly less important than the guys who play 30+ minutes and can potentially close games for you. The Jazz have a massive problem at that level. The problem/solution is our key players. For example, I don't think Gay replacing Niang is going to change much even though he is better defensively. But I do think Gay overtaking Bogey could change things. I think Gay could potentially be an alternative to Bogey, but I don't think Dunn is a true alternative to Clarkson. I doubt Quin would ever sit a healthy JC for a healthy Dunn. If we theoretically brought in someone like Justin Holiday....that level of player is someone who I think could be a real alternative to JC but for me Dunn is below that.
If Ryan want's to spend a boatload of money to have Dunn instead of the grab bag of young players (Oni, Brantley ect) that's his choice and it's not my money. But I'm not sure that's the better option. If the Clippers had dumped Mann for a vet that would have obviously been a big mistake. Mann doesn't happen if he doesn't have a roster spot. Personally, I'd prefer to have Oni/Brantley on the roster because of that potential. I think it's a better value add than whatever Dunn (or any other fringe vet) might provide for us.