My understanding of bulk aging Vers bottle aging is that you end up with a similar product over all because it aged the same way. Bottle aging separates the wine so it ages just a little different then the bottle next to it.it could be it came in contact with light or it was higher on a shelve which caused the temp to be a little different. I tend to bulk age for about 2 months and then bottle are the rest of the time. I don't have room to have multi bulk aging things going on at any one time. Meads on the other hand I bulk age for almost a year because its easier to keep from sampling it then.