I see Helenius' Peters and he looks the exact same as Wlads Peters. Helenius just had better footwork than Wlad and better boxing ability. Wlad is Peter level.
Peter walked through everyone's punch during that era, but I think you're correct, the Wlad left hook had him badly wobbled and even a push would have had on the canvas take an 8 count. If I remember correctly that punch came with 30 sec. left. But. yes, Peter was introduced to "la la" land that evening.