Lead Bullet mystery ?!

World trigger fans I need your help,

I posted my Triggerset in another thread here on reddit.

Honestly it wasn't the first time I posted this set, but back then everyone told me that my Handgun and my Lead Bullet can not be both on the Main trigger, so I switched it up with the Bagworm.

But than u/maniacmartial (hope he doesn't mind I'm making this thread) suggested to switch it back up just for appeal, because that what Miwa is doing.

So I explained my side of the story, because Lead Bullet takes up the whole Triggerside so it needs to be on sub-trigger instead of the main, and I felt confirmed by Ema's explantion and the recent chapter's scenario (Chapter 155). And brushed it of that Miwas's lead bullet is coustomize, I even looked it up in the manga, but in this scene he changes the magazine, maybe Daisuke hasn't been thinking that far?

After further research I looked up every Agent that uses Lead Bullet, 3 if I didn't oversaw someone Miwa uses both the Weapon and Lead Bullet on the Sub-Trigger, Chika use Lighting on Main-Trigger and Lead Bullet on Sub-Trigger but also uses Hound on the Sub, the third one is Matsushiro uses Weapon on Main and Lead on Sub.

The BBF File of Lead Bullet doesn't say anything about it.

Technically Lead Bullet is an Optional Trigger, like Senkuu and Thruster, which are always on the same side as the weapon.

I'm just confused right now, help me out please ;)