Newbie question : RDWC Grow

Newb question:

Popped 3 seeds (autos)
For my 3 bucket RDWC system
2 sprouted, 1 seems dead
They are on day 4 of sprout.
Is it too late to germinate another one to fill the 3rd bucket?
Wondering if by the time they go in if nute requirements will be a challenge for 1 of them.

I’d sprout another one to fill that last bucket. Most autos don’t get real big so there shouldn’t be a big difference in size so they should all eat about the same.