Reasons why Harry Potter isn't a Ravenclaw

Reason #5

5:"Now don't forget to speak very very clearly!", Molly Weasley has said. But then, a second later, he said diagonally. Like seriously, how hard is it to say Diagon Alley?(Also how did he even become the seeker for Gryffindor, when he struggled to catch even a single letter in the air when they weren't even falling that fast?)