In cuspal astrology, identifying the SSL is very important for being able to make any prediction. 

However if it is not possible to do btr and therefore in the absence of the correct sub sub lord, is it possible to make any predictions based on the sublord? Because the sublord doesn't change in a few minutes. So generally when we get the time of birth from the parents, it may be just a few minutes wrong. But sub lord level would generally be correct