Leaving the foot actually gives you a bit of a skid plate in case you bottomed it out on something.
With that said, if you bottom out on a fully retracted jack, you likely have other problems and possibly other damage that the foot isn't really gonna help or hurt.
Leaving it in to keep out dirt, debris, and other junk and/or critters is a good idea.
The answer as to why you are seeing the grease now is that the glob of grease has just settled to the bottom of the tube from where it was originally on the gears. Summer heat will do that to grease. Having the foot there will catch it and prevent you from getting grease on you or your driveway(or anywhere else that you wouldn't want grease to get since it always finds your nicest clothes or shoes to fall on and then you track it into your house or vehicle).
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