In my humble 1 harvest newbie opinion(I like how you worded that haha) I'd say they look over watered and over fertilized as well, and that in the first pic your plants are prob root bound which F's with their ability to get the right nutes, and brings on discoloration that can correct itself if you transplant it on time!
I had it happen not too long ago(a month maybe).
And IDK about the single cola guys, but I'd hit one of them up if I were you. Maybe you've got too much branching for a solo grow hence the being root bound.
Second pic looks a lot better but the leaves are still showing some moisture stress.
The fix I suggest, transplant the solos in 1 gal grow bags and wait until you big plant wilts to water it again, and from then on water it a day before it wilts.
I.e if it wilts after not being watered for 5 days, water it every 4th day. Then when it wilts on the 4th day, water it every third & so fourth so on