Water pups grow as good as sword pups after a couple months -- no diff really. If you want to just cut it & throw it away, then don't cut into mamma corm. I have several pups growing in seperate pots that are growing well. You can always sell or use for a trade. It's really not taking much energy away from mamma - it being so small. Ppl cut pups off when mamma is getting ready to flower & fruit, to give it more energy.
I'd wait & then plant the pups (I hate to see them get thrown out
).