the Cotyledion leaves (first out of the seed) feed the plant its early nutrients and tbh i think normally would have used their resources and fallen off by now! Your plants have developed two decent steps of early fan leaves and these will be using photosynthesis to do the trick now so I'd go for it. Although it's not necessary. I never did mine just had a breeze blowing over my girls and kept the lights close. This should lead to decent strong thick stems ! Mine are as thick as my thumb now.
Hope this helps but I'm no expert just thought I'd chirp in my two cents