Yes I would train under someone less than a 3rd Dan. I started my training overseas while my father was in the USAF. There was always someone transfering in from the Far East & Martial Arts teachers transfering out to different Bases. The 1st question you need to answer is "Can I learn from this person?" The 2nd question - "Is this persons knowledge of any quality or are they lacking in knowledge?" A final suggestion - Do not group all 1st, 2nd, 3rd etc... dans in the same group. I have meet some 3rd and 4th Dans that are not worth the time of day & I have met some 1st Dans and Brown belts that had a lot to offer. RANK DOES NOT MAKE A MARTIAL ARTS INST. KNOWLEDGE & PRESENTATION DOES!!!