Uncertainty, as a condition, is not shared equally between parties of unequal strength. This is the structural fact that Scotland's preparation for 24 June must reckon with, and it is not one that any amount of tactical revision can resolve.

Brazil are debating their selection. The debate is real — Neymar, Casemiro, Endrick, the shape of the side, the weight assigned to this fixture against a group opponent already diminished by results. That debate belongs to Brazil. Its consequences, however, do not stay there. They travel across the preparation window and land entirely on Scotland.

Scotland must prepare for the full-strength version. They must also prepare for the rotated version, which is not a lesser problem — a Brazil side with something to prove and the freedom of players who have been waiting is not a more manageable proposition than a Brazil side of established hierarchy. It is a different proposition. Scotland's analysts must model both. Their coaching staff must find principles that hold against either. The players must hold both versions in mind simultaneously. None of this is true of Brazil's preparation for Scotland, where no comparable bifurcation exists.

This is the asymmetry. The uncertainty is Brazil's luxury. The dread is Scotland's allocation.

The historical record does not offer relief here. Scotland have faced Brazil at World Cup finals before. The outcomes have not varied in ways that make selection debates relevant. The question of whether Endrick starts has not previously been the determining variable in these encounters. That fact is cold but it is accurate.

Scotland arrive at Miami having won one fixture and lost one. A 1-0 defeat to Morocco — Saibari's goal in the official second minute ending any prospect of an early foothold — means that progression from Group C requires a result against Brazil. The Disaster Index sits at 7.1 on this entry. The Index does not move in Scotland's favour regardless of how Brazil's internal argument resolves.

What can be said precisely: Scotland know when and where this fixture takes place. Hard Rock Stadium, 23:00 BST. Everything else about the opposition remains, for now, an open variable. Scotland did not create that openness. They inherit it fully.

The stronger party's doubt does not distribute. It concentrates. Scotland are carrying weight that was never theirs to generate.