The issue with that is you can protect your spot by battling (If I'm number 1 with 6 minutes til payout, I'll engage a battle so no one can battle me for 5 minutes). This would let people more easily and freely defend their spots. I do agree it would be cool to practice battle though, especially to see how your defense does against teams, which guilds could be the place for. But it would only be a nice to have and has little monetization value so it's much lower priority compared to other things.
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this option is already in place, only a full hour before payout. every hour its pay out somewhere