They have most of the musical tools that zeppelin had and are doing their own thing, they are young and learning so their next logical step to truly being great is to expand on their sound and make it as great as they can, take their instruments and vocals and come up with songs that would amplify what zeppelin did with their experimentation. Progress to what zeppelin may have sounded like if they were still around a little longer. Take it to the next level and make the Led Balloon heavier than the old one. Sort of zeppelin on Steroids and start filling stadiums again.