OK as I try to accept Kaman (
a guy the last small market team he played for sent home because of his attitude) maybe the logic goes like this:
Blazers need a backup center because Leonard not ready and Freeland is limited. Not getting Hawes. Kaman available and worth about 3 million or so a yr. Can wait to see if he accepts BAE but might get signed by another team for more. If you offer 3.5 for 2 yrs that would be very competitive but leaves less than 2 on the MLE and about the same as the BAE. Blazers only have two spots open so if you are going to burn the MLE, why not give him the entire thing in exchange for a buyout of 1 million. Kaman gets his 6 million, which I can't imagine he would get more from any other team (or they wouldn't have agreed to this) and Blazers get their flexibility . . . . . .so they can dump him after a yr when they find out he is an unmotivated and lazy center (sorry couldn't resist typing the last part

)
But maybe that's the logic behind throwing this guy 5.8 million???
tl/dr: if going to burn MLE, why not give it all to him in exchange for flexibility . . .