B Lyn and Innes are great candidates because firesweep weapons are best on units that can guarantee you a double. It's basically a function of Desperation without the HP requirement. Having said that, you have to make sure they can hit hard and have the speed to double their targets because you don't want them standing at the end of the engagement. So from your list, Rebecca can't fully take advantage of the weapon because she has 4 lower attack at neutral compared to Lyn and Innes, and Lyn has Swift Sparrow on top of that. The only time you would want to favor Rebecca over the other two is if you don't want to part with their unique legendary weapons.
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