I thought it was impossible for any seeds to be gathered once it was down to two seeds...
I was wrong again.
A somewhat unlikely scenario should actually be possible within the rules.

An opponent might gather seeds (and bring the score to 23:23) in such a way that the only seeds remaining on the board were in your Pot 6 and their Pot 1.
You would then be forced to distribute Pot 6 which would gather two seeds, bringing the score to 25:23 in your favour.

Although your move is forced, it is still worth knowing this.

Okay, I am absolutely confident that no further captures can occur when there is only one seed left on the board!