Oh I understand, So the yeast cake should be a last resort just in case the gravity drops.
I was just saying that brewing a barley wine to produce yeast for a RIS isn’t ideal. Generally you want to repitch from a lower gravity beer into a higher or equal gravity beer.
If you want to brew a beer to build a yeast cake for a big beer fermentation I was suggesting you brew something low gravity as your first batch and don’t use the whole yeast cake, remove part of it after you rack your firs small beer to packageing.