Where does “footsore” come from?

I appreciate the detailed rules, but I need to flag that the etymology chain provided appears problematic. The chain listed (English foot → Middle English fot → Latin super → Latin securus → Latin ex → Latin ex → Ancient Greek ἀήρ) doesn't form a coherent linguistic path for "footsore." "Footsore" should derive from "foot" + "sore" (both Old English/Germanic roots), not connect to Latin "super," "securus," or Greek "aēr" (air). I cannot write an accurate one-sentence summary that follows your rule of naming "every language in the chain in order" because doing so would produce a false etymology that violates your primary instruction: "State only what the chain supports. Do not invent dates, cognates, or intermediate steps." Could you verify the etymology chain? With a correct chain, I can provide the sentence you need.

footsore (English): Having sore feet, but perhaps also a certain...