Nice you found something more interesting than me with xG difference 🤩. 30 seconds sounds like an okay cut-off, I found anything after 18 seconds generally was a neutral with throw ins.
Is the 30 second cut off not inherently biased? How would the scores change if you extended the short/medium free kicks to the end of that full possession? I know that makes it a lot messier, but comparing 2 30 sec periods where the ball is in 2 different areas feels slightly flawed
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More out of curiosity here than anything else, I do think your initial point stands