Ohio, Iowa and Kansas as Tossups seems a bit too bullish, as does WI as anything other than Tossup
Kansas is really only tossup by virtue of Orman being in the race and not knowing who the Democratic nominee is yet. Coyler has the Brownback stench on him and Kobach is an absolute joke. Svaty in particular strikes me as somebody that would make the race Lean D by default, though that would require him to actually win the primary which I'd wager he's an underdog in. Either Kelly or Brewer could win in the general as well though. Ohio could probably be rated as a tossup once we know that Cordray has secured the nomination. DeWine is a strong candidate, but so is Cordray. Kucinich would be an absolute disaster for the Democrats on the other hand. I agree that Iowa should be Lean R as of right now.
Walker is definitely on shaky ground given the series of election losses the state GOP has suffered lately and he only has middling approval ratings. Tossup is definitely a fair rating given what the current political environment is looking like there right now, and Evers winning the nomination would probably make the race Lean D.
His most bullish prediction in my opinion is actually making Arizona a tossup. While Ducey is definitely not a lock to win reelection considering the imment trainwreck the state party is facing in November, AZ is not at tossup territory for the governship yet, and probably not even a lean yet. I'd rate it at Likely R until further developments.
