Nothing really bad, you just mentioned that he paled in comparison to the warboss in PoD -who turned out to be the Warlock.
I kinda liked Kensai, he was a good character in my head, but I'm afraid I couldn't really flesh him out back in the day... maybe if I decide to write crappy fiction, I can work on it there. The basic idea behind him was that he wanted to forge the orks into a cohesive and potent force, unlike the chaotic warband they were under Gaz'thrakas rule. Then after tides where he ate a shamans heart and gained his powers he would've changed, preparing him for the Coming Storm storyarc, hence his armor was swapped to black. He would've been a bit more self-obsessed; quite unfamiliar with his new powers and lusting for more, which would've made the orks motivation clear in the campaign. But he sadly died. And orks are kinda refusing about returning from afterlife, if one dies, he's dead and everybody's fine with it. They're a warrior race, afterall.