This is all crazy talk. He signed a GUARANTEED contract. It pays the same whether he plays 82 games or 0 games. That's part of their legal agreement. The Lakers and Nash are both aware of the risk of injury when that contract is signed, especially with a ~40 year old player. There is nothing selfish about this, period.
Gilbert Arenas is making 22M THIS YEAR. Think about that.
Right. Except it doesn't pay the same if you retire.
How does it pay with medical retirement? I know Brandon Roy got paid, but the blazes got a lot reimbursed, until he played again and Paul Allen got Maaaaaadddd..
How does it pay of you outright retire vs medical retirement? Is it more spread out or something? I guess I could google all this, but I've typed all this so..
Roy didn't actually have a medical retirement -- he was amnestied. 
I think he actually ended up doing both. I only remember this because of the craziness that happened when the T-Wolves signed him after his medical retirement, it changed how he was paid the money still due to him.
Maybe, they amnestied him, and then his insurance paid the amnesty, until he was signed by the t-wolves, then the Blazers ended up paying him. Whatever it was, it's the reason Nic Batum isn't a T-wolf.
You're about 75% there. The Blazers matched the offer Batum got from the Timberwolves before Roy signed with Minnesota:
http://espn.go.com/nba/story/_/id/8178326/portland-trail-blazers-match-minnesota-timberwolves-offer-nicolas-batumIn some ways, losing out on Batum will still help the Wolves. They have more than $14 million in cap room now, and are expected to announce agreements with former Blazers guard Brandon Roy and Russian guard Alexey Shved in the coming days.
That has nothing to do with the fact that when Roy got his max deal from Portland, it was only partially insured because of his knees. The Blazers were able to get 17 million of his deal insured, but that was on the assumption that Roy would be "permanently" disabled. Which he wasn't. So, basically, the burden of payment shifted to the Blazers from the insurance company once he unretired:
http://www.csnnw.com/article/brandon-roys-return-nba-would-cost-trail-blazers-17-millionThat's even more complicated by the fact that, in regards to the amnesty, it worked exactly the opposite way that most amnesty cases did -- none of the money from the contract he signed with the Timberwolves counted against what Portland owed him, the way an amnestied player's deal usually would, because he completely cleared the waivers and was an UFA. So that's where Paul Allen got 'screwed' -- he had to pay the money that was slated to be paid by the insurance company, and none of that was being offset by the Timberwolves deal.
I think that's what I remember about it, in regards to that last bit anyway. I've had to retype it like four times -- need sleep.