Board Thread:Questions and Answers/@comment-29321837-20160727144607/@comment-3104099-20160729180926

LacianaEdelstein wrote: Where did you get that info, i've checked the BBF and couldn't find it. Senku and Thruster are optional triggers that are supposed to be used along side Kogetsu and Raygust, when they activate it's more like they are turned on, like a feature of an equipment, so with that you are still using Kogetsu which means using Senku-ed Kogetsu + shield isn't possible. Also i'm not sure if it is an error in wording or not, but Senku and Thruster DO take up slots in the device like any other triggers. Refer to Q&A 167 of BBF for details.

Yes, they do take up slots, but they don't fill up the "2 triggers at a time" restriction as they take up only one slot when activated, hence you can activate a Kogetsu with a Senku and another trigger simultaneously.

Shield is a default trigger according to the mangaka, not this wiki.