Hexagons can be sewn directly to one another without a path but this does present some challenges.
When sewn directly to another a slope begins to develop. If you are working out the design on a square sheet of paper it feels like a serious problem but this can be resolved with a few filler pieces and my tilting the design sheet.
Another option for assembling the hexagon motifs that doesn't involve a path is to use filler hexagons. In the diagram below I've use pink fillers around the centre and then blue for the next round of fillers.