A future promise does not establish that the current arrangement gives the applicant the authority relied upon. Resolve the actual rights and required immigration process before the proposed work begins.
Use the effective agreement in the application plan
Record which documents are executed and when their terms operate. Do not submit a planned control structure as completed or assume a business closing date grants work permission. The applicant must meet the relevant investment, nationality, enterprise and temporary-status requirements on the actual facts.
Franchisor approval usually comes first, followed by a binding purchase agreement and either completed expenditures or deposit into a qualifying visa-contingent escrow. The standard answer is an escrow arrangement: the purchase agreement is signed, the price is deposited with an escrow agent, and release to the seller is conditioned on visa issuance, with the funds returned if the visa is refused.
Some structures may allow a proposed investment to be assessed while a sale is still completing, but the sequencing needs review rather than an assumption that one must fully close before the other can proceed.