OK.. First thing first
I'll discuss about the Strength First...
Strength is also the power of Impact.. Higher Str = Higher chance for enemies to drop weapon. It is why Bear can disarm weapons while wolf cannot...
Heavy Weapons can disarm more than the light one.. But, Heavy weapons also can be disarmed more and even more chance to disarm yourself...
For more info, Sai has somewhat low Accuracy even it is a light weapon...
Baton is a very weak weapon... Baton is useful only for countering imo...
Whip is the light weapon and not for disarming imo... Maybe Whip has Multi-hit properties which means higher chance of disarming...
Impact is useful for opponent who has MoA or Strong Arm. For High Strength Brute.. Impact is not really needed.. For Agile Brute, Impact becomes "should have" skills...
Your Impact will be the boomerang to yourself, if the enemy has Martial Arts, Thief and Hammer..
Without Impact, It is still no problem.. Unless you really cannot evade your enemy's attack..
Deluge can't be evaded by Impact.. MUST USE SABOTAGE ON THIS ONE....
Hope this answers all of your question..
More Info see here:
https://mybrute.forumotion.com/tips-tricks-f12/skill-s-weakness-and-strength-t1750.htm