I guess thats the most important quote of it:
...it’s that Roper wants to go back to actually making games instead of being “two steps removed from making something.”
“I’m always happiest when I am actually designing. The moments of greatest joy recently are when I am actively advising studios,” he told VB. “The opportunity to actually make a great game is something I have been missing and craving.”
And "recent Improbable spat with Unity had nothing to do with his move." fits this sense.
What you point with "epic\tencets\eu4 and improbable"? @00
Edit: Btw. the comments under the article are quite interesting. This guys splits sides