If they do not meet expectations they will very likely ask again . Applicants have been asked several times for documentation until approval criteria are met.
He has mentioned he was the first to apply for the DTV that is a red flag of sorts. As you alluded to, applying with a gym with a track record of approvals is key
Did you apply for the Workcation option? You can not resubmit via email. Normally for minor mistakes like name they usually give a reason. Do you know why they asked for proof of ownership of your bank account?