True, the maps are good for terran right now. But if you say that Flash can't be bonjwa because of the maps, you have to take away that title from oov and Nada as well. During oov and Nada's time, an OSL round of 16 frequently had 9 or 10 terrans and almost no protosses. In contrast, for 3 out of Flash's 4 titles this year, he was the only terran in the semi-finals. People think that a Bonjwa has to revitalize their race because of what Boxer and Savior did but they forget there are 2 other bonjwas.
If 3 Bo5 victories in a row didn't convince you that Flash was a better player I don't know what to say. The rivalry is one-sided right now. If you feel like you have to 4-pool twice in a Bo5 to have a chance you are not the better player, not even close.
Amount of time:
This was my argument as to why Flash was not bonjwa after Hana Daetoo, and I believe it was valid. However, 4 titles in a year matches or beats every bonjwa's accomplishments, and Flash has 2 silvers and a stellar win rate to go along with it.
Why isn't Jaedong a Bonjwa then?
He won 3 titles in the course of a year but he didn't fit the dominance requirement. After the NATE MSL lots of people still thought Flash was the better player. Right now there is no doubt that Flash is the better player.
While I think 3 titles in a year + being the undisputed best player is a good qualifier for bonjwa, I think the real qualifier is that no matter what criteria you use for bonjwa, a bonjwa will meet it. Flash does.