Everyone should use this before talking about capspace:
http://www.shamsports.com/capulator
Renouncing all possible players gets the Jazz to $31,279,329 assuming the cap is a flat $108 million. That number is not going to be solid until the NBA officially announces what the cap is, but I've seen $109 million floated most of the time, which would put that number at >$32.7 million, which is what the max offer would have to meet. It's damn close.
If you stretch Exum, that gets you another close-to $5 million. If you stretch Korver that gets you another $5.5 million (there's an $888k roster caphold that kicks in).
So the fantasy question for the psycho capologists: if you were to get Tobias and stretch Exum, could you trade Korver for Dinwiddie? You'd be able to absorb $5 million of Dinwiddie's deal outright, correct? In that scenario, does the salary matching number for Dinwiddie effectively then start at approximately $5.5 million ($5 million subtracted from his 2019 salary)? What salary would you have to match to bring in Dinwiddie in that scenario (consider that Korver's number would count for $3.75 million)? Maybe you could just stretch Korver AND Exum to open up enough, or at least close enough to trade a petty contract to make it work (Bradley, Niang)?