I ride the road bike on the road. With rides like these there's usually a window of time in which you depart rather than rolling all together in one big group. And even so, there will be a wide range of capabilities, motivation and speeds and everybody will soon be strung out riding alone or in small groups. Some faster experienced riders may form pace lines with acquaintances, but that's not your concern. And though you may feel more in control on your hybrid, you might note that experienced roadies riding in packs and pace lines all ride road bikes.