A Blessed Day!!!!

I am in the stage of applying for the Settlement Visa and already purchased the documents needed. However, there's one situation caught my attention in meeting the financial requirements. My sponsor (Civil Partner) isnt employed and he doesnt have any evidences to prove about his financial status obviously apart from his bank account. Previous years he was diagnosed and treated from cancer and he's receiving a DLA (Disability Living Allowance) which happens to be one of the exemptions. My concern now is, aside from the official document from HMRC confirming his entitlement and the amount he receives, are there still some ways to meet the UKBA Financial Requirements? Thank you so much and looking forward to hear from you guys.