The tenancy itself isn’t capital because he can’t sell it. An outgoing old-style pub tenant always has a substantial interest in stock, kitchen equipment, furniture, goodwill and so forth which he sells on to the incoming tenant, but this would belong to the business.
Is he claiming HB on the residential element of the tenancy? Do you get to decide how much of his rent is for the accomodation?
Your best bet is to focus on the business. It may be unprofitable if he’s a bad publican or if his landlord’s predatory (if it’s a pub chain, which one?)
Do his accounts cover all his business interests, or just the pub? What else is he doing on the side? Illegal activities such as reselling stolen goods should still be included for this purpose. Are they accurate or are they creative? Are you willing to keep asking for more information until your colleagues in Licensing can get him evicted?