This is gonna be a good thread!
Before rejoining the DE shaving madness, I used to face lather and do only one pass shave. Now, depending on my mood and used razor, I do 2 or 3 passes/touch ups. I don't care if my brush has all that lather for all 2 or three passes ready and right. If it's thin or not enough after the first pass, I add more product. It's particularly valid if I face lather. Typically, when bowl lathering, any size brush can create huge amount of lather in the bowl the way I want it, so the so called 'X-pass rule' doesn't apply IMO.
-= Boris =- The man thinks, the horse thinks, the badger thinks, the boar thinks. The fish doesn't think, the fish is mute, expressionless. The fish doesn't think because the fish knows everything.