Jay Ong was hired by Marvel in May 2014 and he was the guy Marvel wanted to find a publisher for the game that eventually went to Sony.
"Hired as Marvel's vice president of games in May 2014, Jay Ong's first challenge was to discover why Marvel's box office success hadn't translated to games."
"Being from console first-party in my past, I pinged both sides, both Xbox and PlayStation, and said, "We don't have any big console deals with anyone right now. What would you like to do?" Microsoft's strategy was to focus on their own IP. They passed."
-The Ultimate History of Video Games, Volume 2
Phil Spencer was promoted to head of Xbox in March 2014.
"Microsoft has announced Phil Spencer is the new Head of Xbox, taking over from the recently departed Marc Whitten, who served as Xbox corporate VP."
-March 31, 2014.
Microsoft has confirmed that Phil Spencer has replaced the recently departed Marc Whitten as Head of Xbox.
www.ign.com
So we don't know exactly when Jay Ong went to Microsoft, but Phil Spencer was definitely running Xbox.