What do you think of this?

[jxt127]

Memory serves me that the basis of the obstruction penalty is to remove the effects of the obstruction. Direct (type 'A') the affected runner cannot be put out between the bases where it occurred and gets the forward base. Type 'B' just award bases to cancel the effects of the OBS - simplistically put. But I can't imagine taking away the effects of plays made before the OBS or even outs made after indirect OBS when unaffected runners are put out.

In fact even if BR is obstructed before 1b he/she does not automatically get the base when the BR would have been out regardless - specifically on a caught fly ball.