If a rule differs with the statute itself, then it is legally moot. I think MOON Ki already pointed this out.
Here, there is more than that, and it appears that many GoK types and supporters read Rule 68 without reading other relevant material on amendments and the actual decision from the trial chamber.
For a start, the ASP statement is not in a resolution---it falls under "policy"---and is therefore not binding on the court, regardless of issues to do with conflicts between rules and statutes (which you correctly note). Second, the "victory" is not what is claimed, for the following reasons.
What the ASP has said is that it reaffirms its understanding on the non-retroactive use of Rule 68. GoK claims as a victory.
The ASP carefully did not explicitly state what its "understanding" is, but rule amendments are governed by Article 51, of which part 4 states that:
Amendments to the Rules of Procedure and Evidence as well as provisional Rules shall not be applied retroactively to the detriment of the person who is being investigated or prosecuted ...
https://www.icc-cpi.int/NR/rdonlyres/ADD16852-AEE9-4757-ABE7-9CDC7CF02886/283503/RomeStatutEng1.pdfThe court therefore had to consider non-retroactivity; and it did, contrary to the impression given by GoK types.
What GoK wanted has two parts (
blue and
red):
This 14th Assembly decides and clarifies that rule 68 as amended by the 12th session of the Assembly of State Parties (by resolution ICC-ASP/12/Res.7) has no retroactive applicability and cannot apply to situations commenced before the 27th November 2013
https://www.icc-cpi.int/iccdocs/asp_docs/ASP14/ICC-ASP-14-33-Add2-ENG.pdfThe ASP stated that it "reaffirmed its understanding" on
blue, but did not say anything on
red.
The real issue, however, is that the court already considered non-retroactivity of the rule. The OTP argued that, in the legal sense, its application did not involve retroactive use. The argument is a bit long, but briefly:
25. Here, however, the application of the amendments to rule 68 to the present case is not dependent on "past occurrences or events", nor does it abrogate any preexisting rights or duties ... Therefore, the rule against retroactivity is not engaged.
https://www.icc-cpi.int/en_menus/icc/situations%20and%20cases/situations/situation%20icc%200109/related%20cases/icc01090111/court%20records/filing%20of%20the%20participants/office%20of%20the%20prosecutor/Pages/1866.aspxThe judges agreed with that:
23. Turning to Article 51(4) of the Statute, the Chamber does not consider the relief sought to be a retroactive application of the amended Rule 68. The Prosecution's Request is not seeking to alter anything which the Defence has previously been granted or been entitled to as a matter of right.
https://www.icc-cpi.int/en_menus/icc/situations%20and%20cases/situations/situation%20icc%200109/related%20cases/icc01090111/court%20records/chambers/tcVa/Pages/1938.aspxSo the real issue before the Appeals Chamber is not, as some think, whether the rule
can be used retroactively; it is whether it
has been used retroactively. The ASP statement obviously has no effect on that question, and it is still the Appeals Chamber's understanding that really matters. After that comes Osuji's Article 69 point.
The other part of the GoK request was that the ASP:
Decides to appoint an ad hoc independent mechanism of 5 independent jurists to audit the Prosecutors' witness identification and recruitment processes in the case of The Prosecutor v. William Samoei Ruto and Joshua Arap Sang, Case Number ICC- 01/09-01/11, and establish and determine the veracity of allegations of irregular procuring and coaching of witnesses In the case.
Decides further that the ad hoc mechanism shall report to the Assembly within 6 months of its establishment.
That was completely rejected. Instead, the ASP gave a vague statement that the Independent Oversight Mechanism should be fully implemented.