I get what you're saying but Jan's primary game (in the UFC at least) was always kickboxing, with some aggro submissions thrown in there. When he lost, it was because his grappling and TDD wasn't up to par with guys like Cummins or Anderson... well, that and his cardio. Even in his losses though, his standup skills still stood out, like when he turned Gus into an NCAA All-American after rocking him a couple times early. He didn't have the finishes against top level guys per se, but for Joe to give Rockhold the edge in the standup made no sense to me at all. It also belittled Rockhold's incredible ground game to boot.
Cliffnotes version, Rockhold is a better grappler than he is a striker and Blachowicz is a better striker than he is a grappler but Joe was stating the reverse.