You would like to bring in reinforcements and then you see Kemba and Knox as players who can help us achieve that? Really? Boston got rid of Kemba, Oklahoma then bought him out and then he dropped out of our rotation after a month. Knox is out of rotation all the time. Why would any team want them? I have no doubt that someone would take them, but for peanuts, not to give a good player for them.
I, like most here, like RJ, IQ, Obi, but you need to be realistic and if we want a good player, the other team will want at least two of them plus picks. Kemba can be part of the trade just for the salary matching, not because he brings some value.
As I already wrote, I don't think we did a good free agency and if we now give RJ plus picks for a "good" player who is not a star, I'm not sure it will be a good move because it will not raise the team to a higher level and we will lose our trade capital. If we can really get someone like Turner or LeVert without losing RJ, I would of course do it.