Michael was bombarded with countless questions from Lincoln, the Barscht triplets, and Zeke, but he didn't pay much attention to those questions.
He didn't want to go into detail, and the others couldn't force him to reveal more information about his Soultraits either. It was generally known that everyone was allowed to keep secrets about their Soultraits.
That was also the reason Michael wouldn't be questioned about why he hid Spirit Whip during the aptitude assessment. Some may wonder why he did that, but it was his choice to do so.
Nonetheless, Spirit Whip had been exposed, and it wasn't impossible for everyone to collect information about his three Soultraits. In this era of technology and starnet, nothing remained hidden once exposed. Everything would be documented somewhere.
It was a pity that he lost one of his trump cards, but he had been ready to expose Spirit Whip from the beginning of the Realm Combat assessment, so it was fine.