I will preface this by saying
I am both an OKC fan, and I cannot stand Blake Griffin even remotely. Now though, as an objective official viewing a video of two faceless, nameless players:
It does not look like there was malicious intent on Ibaka's part. At the time contact was made, he is looking at the rim to find the ball for a potential rebound. At the 3-4 second mark you can clearly see Griffin Holding Ibaka, pulling his jersey.
Ibaka attempted to shove Griffin's arm off and then attempts to swipe it. The contact was excessive, but in my estimation neither calculated or malicious, and it does not appear he aimed to hit Griffin in that manner. Personally, I feel an F1 was the correct call. Had Ibaka been looking down so he could see where his hand was going, easy F2.
Personally I don't think the league office will upgrade it; it was not excessive when viewed in the light of attempting to free himself from Griffin's hold and not looking at where his hand was going. It also seems to fail several of the published factors they look at for upgrade/downgrades.
In a HS game I go up to intentional here without any thought, and consider flagrant until I process everything I saw and leave it alone (all while wishing I had gotten the hold if I hadn't called it).
Relied on
this video.