Without the bbPress Threaded Replies plugin, Replies to Forum Topics and Replies just list in sequence when using just bbPress.
Activated bbPress Threaded Replies and the replies to replies were placed correctly. Some basic setting come from Dashboard > Settings > Discussions > Other Comment Settings.
However the threaded replies are not indented as happens with Threaded Comments for Posts. Using the Education Theme and the Genesis Framework. Don’t know what supplies the indenting on threaded Post Comments.