TickTockMan
"Repent, Harlequin!"
The Senate is in session when it says it is.
Senate Republicans don’t plan to let Obama replace Scalia over recess (Washington Post; February 2016)
No Rest, or Recess, for Senate This Year (Roll Call; March 2016)
Following links from your first link shows Obama did appointments anyway.
Regardless of continuing to hold pro forma sessions, on January 4, 2012, President Obama appointed Cordray and others as recess appointments.[19][20][21] White House Counsel Kathryn Ruemmler asserted that the appointments were valid, because the pro forma sessions were designed to, "through form, render a constitutional power of the executive obsolete" and that the Senate was for all intents and purposes recessed.[22] Republicans in the Senate disputed the appointments, with Senate Minority Leader Mitch McConnell stating that Obama had "arrogantly circumvented the American people" with the appointments. It was expected that there would be a legal challenge to the appointments.[23]
On January 6, 2012, the Department of Justice Office of Legal Counsel issued an opinion regarding recess appointments and pro forma sessions, claiming,
"The convening of periodic pro forma sessions in which no business is to be conducted does not have the legal effect of interrupting an intrasession recess otherwise long enough to qualify as a "Recess of the Senate" under the Recess Appointments Clause. In this context, the President therefore has discretion to conclude that the Senate is unavailable to perform its advise-and-consent function and to exercise his power to make recess appointments".[24][25]
https://en.wikipedia.org/wiki/Recess_appointment
If he could do it for other departments/agencies he could have did it for SCOTUS. It comes down to he didn't want to.
Also the Recess appointment was just one thing that was brought up at the time. There were other ways he could have seated Garland as well. He didn't even pretend to do his job.


























