Thinking about following case, two continuous delegate are happen to be the same, for example

Delegate Alice finds that she happen to be the delegates of two continuous block (she can check that while mining, 1% chance each block), x block, and x+1 block

So in the x block, Alice know that she will be the delegate of x+1 block (1% chance), and maybe she can selectively choose the secret_x for x + 1 to publish, to make the updated random seed[x+1] as she wish, making that she will be the delegate of x+2 block, and so on...

random seed updating might need to involve more secrets etc....