You as the creditor decide if you will require signatures on the LE and CD. You are only required to give a copy of the disclosures to the primary obligor, so you wouldn’t be required to give the disclosure to the co-signer. See 17(d)(2) below. If your bank chooses to obtain signatures we believe it is prudent to obtain the signatures of all obligors.
1026.17(d)(2):
2. Multiple consumers. When two consumers are joint obligors with primary liability on an obligation, the disclosures may be given to either one of them. If one consumer is merely a surety or guarantor, the disclosures must be given to the principal debtor. In rescindable transactions, however, separate disclosures must be given to each consumer who has the right to rescind under § 1026.23, although the disclosures required under § 1026.19(b) need only be provided to the consumer who expresses an interest in a variable-rate loan program. When two consumers are joint obligors with primary liability on an obligation, the early disclosures required by § 1026.19(a), (e), or (g), as applicable, may be provided to any one of them. In rescindable transactions, the disclosures required by § 1026.19(f) must be given separately to each consumer who has the right to rescind under § 1026.23. In transactions that are not rescindable, the disclosures required by § 1026.19(f) may be provided to any consumer with primary liability on the obligation. See §§ 1026.2(a)(11), 1026.17(b), 1026.19(a), 1026.19(f), and 1026.23(b).