I have no problem with the way Ibaka stepped up on Griffin in that GIF. All Griffin can do effectively is drive to the hoop for dunks/easy baskets. As a defender, when you see the ball is headed his way you need to step up and cut off his lane to the basket.
Did that look a little awkward? Yes...but the right mentality was applied.
Ibaka is 23 years old and has made two 1st Team All-NBA Defense teams as well as lead the league in blocks for three straight seasons. He is athletic which means he can rotate quickly, guard pick and rolls, and offer weak side defense. Rim protection is an important part of defensive schemes and I'm glad that I have the best rim protector in the game.