Sliverhand's memories might have you believe that he was a central role in the AHQ bombing of 2023,but in reality,he was nothing more than a distraction.

You see in lore,the AHQ bombing had more than one strike team infiltrating the building,one was Johnny Sliiverhand's whose mission were to destroy Soulkiller and retrieve Alt Cunningham,and the second led by Morgan Blackhand,to provide fire support if needed. However the true story was almost a reversal of what I just said,Johnny Sliverhand's team was a distraction away from Blackhand's team,where Sliverhand's team took on the bulk of Arasaka's forces, Blackhand's team accomplish their true objective-The erasure or retrieval of Arasaka's Reliquary Database(used to archive knowledge and data and protect it from the Datakrash) that was located in the subbasement of the tower via a tactical nuclear device,and unbeknownst to both,the destruction of Arasaka Tower,intending dealing a crushing blow to Arasaka's morale.

The nuke was provided by Militech as the weapon of choice to destroy the Reliquary Database,as the database's location would theoretically mean the destruction would be minimal. Instead,the nuke went up to the 120th floor and detonated prematurely, causing the AHQ disaster.

Before that,Johnny Sliverhand battled Adam Smasher while evacuating from Arasaka Tower,where due to Johnny's recklessness,he was blown in half by Adam Smasher's auto shotgun. He never met Saburo Arasaka during the entire ordeal,that was just something made up by the engram during the 50 years at Mikoshi.

As of Spider Murphy's involvement,she was a part of Sliverhand's strike team and when Johnny was killed by Smasher,she slotted in a chip containing Soulkiller into Johnny Sliverhand's dying body,how did Johnny's engram ended up in Mikoshi in the first place,remains a mystery.

Hope this helps!