Who should get my Bold Fodder?

I currently have three candidates in my barracks that are in need of Bold Fighter, but I can't decide who should get it first.

1. Grima - he's part of my Arena Core, along with A!Tiki and Effie. He already has Steady Breath and Aether so Bold Fighter would "complete" his set. Tiki and Effie are also both enemy phase units so it would be nice to have a little more balance. The problem is that Tiki is running Guard/QR so Grima wouldn't be able to use the Bold Fighter / QR setup.

2. Zelgius - He's currently running his vanilla skillset but I'm a big fan of Steady Breath / Bold Fighter Zelgius. Could technically replace Grima in my Arena core eventually since either dragons or swords give her the BoF stat boost. He is also +ATK/-RES, so pretty much my ideal IV nature for him.However, he isn't fully built like Grima so I would be waiting for Steady Breath before finishing him.

3. Halloween Jakob - Currently running his vanilla set, but I have Brave Bow fodder ready to promote so that he could use Bold Fighter / Brave Bow combo. Would still need Death Blow but that's not as difficult to come by as something like Steady Breath. While he probably wouldn't be a part of my Arena core, I think he could be helpful for PvE or fun to put on an Arena defense team. The big pro for Jakob right now is that Bold Fighter would change his playstyle more radically than it would for Zelgius/Grima. Unfortunately his IV's are something like +HP/-RES

I like all three of these units, and I think I'll get good use out of any/all of them no matter who ends up inheriting it. And there's a possibility of getting more Bold Fighter for the others later on. Any input here would be appreciated though!