Board Thread:Questions and Answers/@comment-29321837-20160727144607/@comment-3104099-20160729140213

Using Grasshopper alongside 2 Scorpion is impossible.

On that note optional triggers like Senku and Thruster does not use up a slot, hence you can activate a Senku-ed Kogetsu + shield (or any other trigger) at the same time. This was mentioned in BBF or Q&A (I forgot).