For one item type, it’s a 1/7 for left-side gear and a 1/5 for accessories. Subtract the values you see on the table to get the probability of all other members obtaining the item. Add the 2 probabilities, divide by 4 (for light party) or 8 (for full party), and tell me how my suggestion is magically affecting all party members’ chance to acquire it.
My suggestion is a general solution: Unlock need button for every item and everyone, irrespective of role/job/class.
I am not addressing things on a case-by-case basis, so I am not sure where you see the “bouncing”. Perhaps you are implicitly merging my suggestion with the OP’s. This would result in a different suggestion “bouncing” between a general and specific cases if you cared to formulate it and falsely attribute it to me, and since you didn’t you have no grounds for your claim.