The reason why some of the HexBs have additional "things" with them is because they dont quite fit the criteria to make a HexB on their own, usually not quite enough fibre. However, eating MORE of that thing wouldnt be too good either, probably in Mueslis case because of the dried fruit and nut content. So you are advised to have a smaller amount of that, with an additional piece of fibre. If that makes any sort of sense...