Mick
As I understand it, the RNFSAIC report is not 'senior' to the BOI. Depending on who you ask, either the RNFSAIC support the BOI to come to their conclusions or that the RNFSAIC report directly to Fleet. But either way, it should not be possible for the reports to conflict greatly with eachother - at least not without the reconvening of the BOI and/or written clarification by Fleet.
Interestingly, the quote I see on the Sea King BOI is that they believe that RNFSAIC were there to help them
para 5
" The RNFSAIC was tasked to conduct an accident investigation in support (my emphasis) of the BOI....."
This equates with the current regs regarding accident investigations and Service Inquiries (what were BOIs), JSP832, where it states
"Service Inquiries for aviation occurrences are supported (my emphasis again) by specialist investigations conducted by RNFSAIC for RN aircraft and in-theatre RAF aircraft, AIEFSO for Army aircraft and the AAIB for MAFTR and out-of-theatre RAF aircraft."
Therefore, if there are discrepancies between BOI and the later RNFSAIC (eg the discussion about 'playmates' and also autokinesis wrt disorientation by the HISLs), then perhaps it is only right to ask for clarification by the BOI and or Fleet.
flipster