In advance of this being implemented could the following be please taken into account in the name of fairness.
The loot that players participating in a joint attack should be divided according to the number of attackers each attacker sends.
Else one player could contribute say 1 spy and large numbers of pochteca or polom and get the majority of the loot which is obviously unfair.
of course some Alliances could send attacking troops in advance of the pochtecas and polom and if so then the sharing of the loot is something that might need to agreed to in-house of each Alliance and not something that the DEVS can sort out.