The matters I have set out at [48]–[51] above were thus within the Arbitral Tribunal’s contemplation. Consequently, as the respondent says, the relevance of Clause 9 would have been something that the Arbitral Tribunal considered and applied its mind to. Ultimately, the Arbitral Tribunal applied its mind to what it determined to be the essential issue of the dispute, ie, the enforceability of Addendum No 2. While the applicant may view the effect of Clause 9 as its “primary and dispositive defence to liability and quantum”, it is ultimately the prerogative of the Arbitral Tribunal to decide which issues were essential for determination: BZW at [60(a)]. It thus appears to me that once the Arbitral Tribunal found Addendum No 2 to be legally enforceable, the issue of Clause 9 faded away. The outcome that Clause 9 was not relevant would have flowed from the determination of the logically antecedent issue of Addendum No 2’s validity. This is because Addendum No 2 deemed both [Company H]’s Certificate, and the Inspection Authority’s Certificate vis-à-vis the specified parameters, as final. There was thus no need for the Arbitral Tribunal to expressly discuss Clause 9 when setting out its reasons in the Award. Overall, I am mindful that an issue need not be expressly addressed in the arbitral tribunal’s reasoning as it could have been implicitly resolved: TMM at [77].