Addendum 662-1 : 1
During situations, where a person is lying/doing actions which may cause harm to SCP-662-1, SCP-662-1 will react aggresively towards the person executing those said actions. In this situation, even if the Bell Holder told SCP-662-1 to listen to a person which is doing the actions said before, he will still react aggressively.
Addendum 662-1 : 2
SCP-662-1 is able to deny the Bell Holder's request/order if that order can actively prove danger towards SCP-662-1. For example, if the Bell Holder told SCP-662-1 to ignore all Class-D and a Class-D came inside to attack SCP-662-1, SCP-662-1 would ignore the order and kill the Class-D.
Addendum 662-1 : 3
SCP-662-1 is capable of remembering previous requests, but they are not capable of remembering any memories before their death. For example if Class-D asked SCP-662-1 for a weapon, SCP-662-1 will remember that in the future, but if they are killed after a request is complete, they will forget all of their past memories.
Addendum 662-1 : 4
The reason behind SCP-662-1 following all orders given by SCP's as if they are a bell holder is because he's trying to get favors from that he intends to use on requests made from bell holders in the future. For example, if he helps SCP-173 in a breach, he expects it to help him back in a future request made by a bell holder.
Addendum 662-1 : 5
The reason for what SCP-662-1 gives being depended on personnel and department rank is because he has a "trust" system where he will trust more to higher security class and department rank, he also said that he might give to people he considers "friends". I have suspicion that the reason behind this limitation is the same as my previous addendum, he's trying to get favors just like how he does with SCP's. The higher the rank, the more he wants this favor and more he's willing to spend for it.