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One group can fool you. Even a perfect rifle won't put two 5-shot groups in the same spot. Each group's center lands a little off at random, so one group alone can say "0.2 mil high" when nothing changed.
More shots, better answer. Averaging several groups cancels that randomness out. Four groups pin down the center about twice as well as one.
But zeros do move. Barrels wear, mounts settle, and ammo lots change. So old groups shouldn't count as much as new ones.
ZeroTrust measures your rifle and picks the balance. It compares how far your group centers move between sessions with how big your groups are. If centers barely move beyond normal group noise, your zero is steady, and it averages many groups. If centers keep moving, your zero wanders, and it leans on your newest group.
The ± number is how sure the estimate is. About 2 times out of 3, your true offset is within that range. If an offset is smaller than about twice the ±, it may just be noise, and ZeroTrust tells you so.
Sudden jumps. If a group lands much farther away than noise can explain, something probably changed, like a bumped scope or a new ammo lot. ZeroTrust starts fresh from that group instead of averaging it away.
Start and end of day. Logging a group when you arrive and before you leave gives two readings per range day, and shows how much your rifle shifts from cold and clean to warm and fouled.