The plant has a genetically Predetermined "maximum" amount of bud it can produce, its said that certain strains will divide equal amounts to the topped region in the amount of what the top cola would have held.. I say this because some strains wont reach that maximun amount without being topped as it does not have the branching to do so. Blueberry is one strain used in the grow bible as one of these examples....
If you top, give the plant a chance to establish the new growth before flipping...