OTOH, if by this you mean that both gases will have equilibrium densities and partial pressures that more or less exponentially decay, with distinct exponential constants so that the static equilibrium mixture will not end up being perfectly homogeneous
over very
large vertical
distances, especially if one
molecule is physically much
larger than and more massive than the other, I don't have a quarrel with that (and neither does Dalton), although I would want to work out the numbers.