Thank you for your reasonable response. 

Re "the way to know, within reason, is to submit it to the tribunal": I was responding to the "then it is adultery" assertion. The truth is we don't know, so we should hesitate to cast those stones. You can still assert that the person is violating church rules, but an absolute assertion of "Adultery!" is not warranted. And, it seems that Francis is changing the church rules here, which he can do. 

Re the Pauline privilege, the church can't really go back on that one without contradicting Paul in 1 Corinthians. The principle that certain marriages can be dissolved goes back 2000 years and is in the bible.

Re "given the power to bind and loose": I think the church should do that in regards the divorced in some cases, as the Orthodox do. That was Cardinal Kasper's original proposal, which was roundly rejected by the conservative bishops. Ironically the appeal to conscience approach that was substituted may prove more radical in the long run.