As usual, Occam's razor fails again when conspiracy theorists put their heads together. I see no proof presented to confirm that Rice's requests were political, aside from her being associated with Obama. She had every right to request the unmasking of individuals if it was pertinent to the understanding of the conversations being monitored. In some cases, unmasking is necessary to let an individual know if they are being discussed by other parties with ill intent. In such cases, it would be gross negligence if the third party were not informed, and then came to harm.
As I recall, the Slate article even brought out the fact that it most likely wasn't illegal for her to request that information. Also, any attempt to correlate unmasking with leaking is baseless.
From what I can see, the assumption has been made that solely because it was Susan Rice in the Obama administration who made the requests, it was automatically a nefarious plot. No proof given, only claims of malfeasance.
I found it comical that as soon as this report aired, the comment section on Slate was inundated by right wing trolls, who pounced on this little scrap of nothing like a pack of wild dogs in their need to have any confirmation of Trump's Tweet.
When you have any credible evidence to show that Susan Rice leaked the names of Trump's associates to anyone in the intelligence community who wasn't entitled to that information, I'll listen.
Till then, you are simply conspiracy theorists, with a clear bias that consumes you with hatred for anything Obama, and willingly led by any news, however baseless, that confirms your bias.