Did the BPA rep provide reasons as to why they withdrew the spinal fusion and scarring applications? Off the top of my head - and with the usual caveat of not knowing nor getting into too many case particulars - scarring is not in and of itself a medical, pensionable/awardable condition, unless it is part of a skin condition, or due to gunshot/shrapnel and causes some form of impairment.
I'm not 100% either on the spinal fusion as a medical condition. Spinal fusion is a medical procedure used to correct a medical condition, such as a broken T12. Any disability resulting from the fusion would be related to the original reason behind said fusion, which is the broken T12.
An adjudicator has some degree of latitude in proceeding with claims as they have (in most cases, and I don't want to get into that debate here) some degree of medical expertise, and also have access via referral to medical practitioners who can review the claim and provide a medical opinion as to a service relationship, cause, etc..
Withdrawing a claim can work in the applicant's favour, providing you with time and iguidance as to what may be required to succeed in your claim, rather than the Department denying it due to lack of information, medical evidence, etc., causing you the applicant to go through possibly unsuccessful Departmental Reviews and then subsequent review and appeal levels at VRAB, due to lack of info, etc.
Also, the Table of Disabilities is used to assess the degree of disability resulting from a medical condition, and not used as a basis for awarding entitlement to a disability pension/award. The Department uses its Entitlement Eligibility Guidelines to such an end.
If you want to discuss particulars, feel free to pm me