By splitting everything up by five you may not carry over all that is needed to finish fermenting. You may....
a) Stir well then transfer to your 5 carboys putting all the yeasts and nutrients in suspension.
b) Ferment to dry in your 6 gallon primary.
I myself ferment dry in my buckets. If the temps. are chilly I will snap on a lid w/airlock and let it finish the last 3 days or so as the CO2 coming off will deminish. Normally I just leave the lid on unsnapped and stir twice daily till dry for 2 -3days in a row. Use your hydrometer to tell when fermentation is finished.
I believe transferring to 5 carboys is more work than needed since you will have to transfer back in a week again anyway.