If a trustee determines that an allocation between principal and income required by § 61-409, § 61-410, § 61-411, § 61-412 or § 61-415 of this title is insubstantial, the trustee may allocate the entire amount to principal unless 1 of the circumstances described in § 61-104(c) of this title applies to the allocation. This power may be exercised by a cotrustee in the circumstances described in § 61-104(d) of this title and may be released for the reasons and in the manner described in § 61-104(e) of this title. An allocation is presumed to be insubstantial if:
12 Del. C. § 61-408