In this Yay clip, he said that Sen only started seriously practicing last week - partly because Tenz has been moving.
And like - they could have snuck some practice in, Yay could be wrong, etc - but I'm worried Sen won't qualify since NA is looking so stacked rn. An unpracticed Sen just doesn't seem as solid as the current level of competition.
Edit: this got more attention than I thought it would. Just want to add that I do hope SEN perform well, and there's no way to really predict any team's performance till we see the closed qualifiers.