OK, what you say makes sense to me. You are doing brush development primarily as a way to get, 1) very even develoment, and 2) be able to inspect image formation during developoment.
But then, what advantage does brush development have over standard development by inspection in trays using oversize trays? I don't develop this way but people who do tell me that you can get very even development with single sheet tray development, if done in oversize trays, say 8X10 film in 11X14 or 16X20 trays, etc. And even this method appears to be much less work intensive than brush development?