He meant legal ball at the post - so they can just scoop it up after the kick.
As to the question iabout switching the ball for punts (as we do for free kicks) - we don't in my association in Germany, unless it is too wet, but then we will try to take team A's ball - just like any other play.
As to El Macman's post - neither team has a right to dictate which ball(s) to use. We will use the best possible ball available with the least possible delay. It is not incorrect to use a legal and approved team B ball for the FK, and we might or might not get a team B ball for a try after team B scores. It doesn't matter, as all the balls are acceptable.