Are you using any fertilizer? Swords are heavier root feeders and could benefit from root tabs if you aren't using them
Yes crypts are also root feeders and would benefits rom the tabs as well. No you also don't need to use dry ferts if you don't want to, what kind of lights over what sized tank do you have?
Looks like they aren't getting enough nutrients. When did you plant them? Sometimes new leaves due off when they first get planted
It appears to be phosphate deficiency in the sword. Swords are very heavy root feeders and actually prefer having root tabs high in phosphates and iron. I use the phosphate and iron tabs for my sword that are sold by AquariumPlants.com Plus I give them regular root tabs along with the speciality ones. Crypts are root feeders also and with having the Mi Oya crypt using extra iron root tabs will benefit it color wise.
Are you using any fertilizers in the water? With your lighting good ferts and the addition of liquid carbon would give your good growth. I use dry ferts because they are very economical and IMO easy to use.
There is a seller ( Ghostshrimp ) on here, that sells Root Caps and Tabs. He can get you what you need faster and cheaper.
Would Seachem's liquid phos help or do they have to be root tabs?
Liquid phosphate might help a little bit but root tabs high in phosphate and iron will do the most for swords since they mostly absorb nutrients via their roots.