Could you expand on your statement? Sounds like an interesting part of the puzzle.
Roberts' inoculation came about when he upheld to decline ruling obamacare unconstitutional when it first hit the USSC in 2012. This gives some political cover in the forum of public opinion for Roberts to rule against Obamacare after that decision.
Kagan had this to say about a different case (quoting an LA Times article):
In Michigan vs. Bay Mills Indian Community, for example, Justice Elena Kagan noted that "this court does not revise legislation … just because the text as written creates an apparent anomaly as to some subject it does not address."
Get ready for an even bigger threat to Obamacare," Jonathan Turley, Los Angeles Times, June 30, 2014
http://www.latimes.com/opinion/op-ed/la-oe-0701-turley-obamacare-subsidy-halbig-20140701-story.html