I actually like this idea. Darko has been averaging 8-9 points, 5-6 rebounds and a couple blocks the last couple years, and he's still young and has potential that can be brought out with Doc, KG and company. I haven't watched him too much, but from his stats it seems like he's a decent enough defender. The contract is concerning, but $5 mil a year isn't the biggest gamble in the world.
Randolph would be great, a guy that young and athletic at the backup 4 is what we are all looking for, although I'm not sure Minnesota is going to give him up for Jermaine O'Neal.
I'm also not sure if JO will come back to play if it's for a team like the T-Wolves, but who knows. They're looking for a veteran, right?