My opinion would be to sync it up so that you can transplant you seedlings from that solo cups somewhere between week 2 & 3 of them being in the solo.
If you look at my last group of posts w/pics, the last seedling is the same age as all the others but it got root bound because I kept it in the solo for too long.
I wanted to go with the solo the whole way, buy I guess the White Widow didn't like it bro.
You can clearly see the difference in the size and to the degree that it was stunted! Peep that for some inspiration/motivation to do the right thing lol.
Tho good thing is, if you catch them soon enough and transplant them, they bounce back like nothing ever happened.
You'll see the difference in growth with my next groups of photos and it's a BIG difference.
So IMO bro, transplant on time.
SomeBeech was telling me to transplant a couple times. Each time we should treat the are of the the transplant with mycos.
That way e get some good fungi in the soil. The mycos has made a BIG difference in this gens seedling growth, vs my first gen which are now the huge ones you see.
The difference is day and night and you'll see sooner than later haha.
Next run Im gonna fucking kill it bro!!!
I'm gone kill this one too hahah