That was pretty much my take as well Marco. Seems like trying to use Cella as a shave stick would be like herding cats.
You should try it as a shave stick. I have a shave stick tube I bought from WCS filled with Cella. I pack the tube with Cella and press down on it. I then twist the soap until it is over the lip of the tube and a quick pass around my beard gives me enough soap for a four pass shave. It is fantastic that way. You don't have to rub as much as you do with a hard shave stick such as La Toja and there is no need to wet the shave stick.