Use of Recipe Standard qty in OM and cost impact

Cost rollup :How does the Total output qty ( I see defaults from the Formula qty) (pointer 1) and standard qty ( pointer 2) affect the cost rollup ( if at all) please?

Close variance : Would a batch created different to the standard qty ( even though scaled properly) will get a Close variance (all rest of the things remaining perfect - ingredients perfectly issued, prod with no yield variance ). It seems so it does and I cannot explain the purpose of this data.

I tried going through the OPM costing guide but I cannot find a clear answer.

https://docs.oracle.com/cd/E18727_01/doc.121/e13655/T388436T388441.htm