saoralba, if the discussion you're alluding to was between dryden and myself, early on page 2 of the thread , there were two strands.
1. In 32ac the unchecked second letter needed to be moved for the grid fill to work. This was incorrect, caused by use of the noun, rather than the adjective as the answer. Using the adjective the grid fill works fine, and the unchecked cell remains the same. It has to, because there is no instruction to alter any cells which do not appear in down answers except in cells I to VI.
2. In all but two across answers, the letter which would go in the unchecked cell if the answer was entered normally was the same as the one entered in the jumbled answer. The two exceptions are 32ac and 40ac. It would have been elegant if all answers share this property, but they don't and nowhere is it a requirement.
Please explain why you think that MINI as 40ac does not work?