Your links are social networking happy hour sites, gossip sites, wikipedia and some are even third parties that mention but not definitively identify a list… and only mention some members but you use them as if they are exclusionary. Some are so old, they may have been true when the partnerships and benchmarks are still being shaped, but are no longer valid now.
Mine are clearly about CURRENT OFFICIAL inter-university BENCHMARKS and WORKING PAPERS that explicitly define what “Ivy Plus” means.
The one library link that you’ve reposted several times? Very authoritative.
Here’s one for the road:
Stanford and MIT
^ Bloomberg Businessweek is probably not good enough for you though.
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“Ivy Plus” sounds like the XX-section of an upscale clothing boutique.
Well that was fun.
@BrianBoiler - get used to it! 
This is the kind of thing that happens when a Duke person (@jenniferclint) comes over to a UChicago thread.
Oh c’mon @CU123 - ALL are welcome (to a good fight).
@JBStillFlying Much appreciated!
Never have so few fought so little over nothing …
@Chrchill your inner-Winston is busy in there spinning paraphrases.
He never fails to inspire …
But, dear friends, we must remember the immortal words of the Bard: “Rightly to be great is … greatly to find quarrel in a straw when the honor of the University of Chicago is at stake.”