This is only my opinion, but what if Haarms doesn't want to get stuck in the paint all game. Perhaps he wants a school that has other bigs, so he can float around the perimeter a little bit. Perhaps Cal can sell him on floating around the perimeter, but Haarms would be the only Center (if Richards leaves) and will be in the paint almost exclusively.
The reason why Sestina and Travis could shoot 3's is because Richards was a Center and would allow those two to float around the perimeter.
Maybe that is why he has a team like Gonzaga on his list, because he knows they have a Center and he can play on the perimeter. Also, their competition is not as good, so he can pad his stats a bit by playing lesser teams and still get exposure.