I agree with all of this. They are similar situations. But not the same. What durant did looks weaker and more like a bitch move than what lebron, kg, allen, bosh did is all I'm saying.
I wouldn't even compare it with Allen and KG. Both teams knew that they couldn't find complementary players for their aging and impatient stars. So they received assets in return. And neither of those guys at that point were undisputed top5 players anymore. (KG was all nba 3rd team in 07)
But yes I agree that Durant's move looks weaker as I tried to illustrate with the mountainclimbing analogy. I just don't agree with the sentiment of SAS that you can't compare it in any capacity as it's still 2 top5 players teaming up.