You're assuming that the attack die kanan subtracts would always hit, but it wouldn't. Sometimes, kanan will be used to subtract an attack die that was going to miss anyway. To use your example: 3 attack dice, miss hit, hit. With kanan, the die that didn't hit was never rolled, but you still have two hits. .with Jan, one of the two hits is evaded, so only one hit goes through. See?
Now you're assuming we know which dice are going to hit or miss ahead of time. If that were the case, we wouldn't need statistics ![]()
3 attack dice deal 1.5 hits or 2 with a mod (focus or TL). 2 attack deal 1 hit or 1.5 with a mod. So Kanan reduces the incoming hits by 0.5 more or less. An evade token reduces it by 1. That's not the whole story though, see my post above...