In addition -- some of that can be variegation and less than idea early growth that won't be representative of future growth. The blotchiness of first single-bladed leaves is likely nothing.
New growth does show signs of chlorosis, which is worth a thought or two, but maybe not a reaction, yet.
Your problems could be related to the issues of a tiny plant in a big pot. Makes it nearly impossible to have good watering habits, which could contribute to what you are seeing, too.
Even if you grow autos, use appropriately sized pots. You'd have to be a raging lunatic and purposely smash up a rootball to 'stunt' a plant from potting up. If you can't do a simple things like a pot-up without damaging the plant, then you should look for another hobby. Urban myth. The problems of a small plant in a large pot heavily outweight the .0001% chance something goes wrong potting up.