There is no difference between opened and unopened caps. The majority of experienced mushroom cultivators wait well after the veil breaks to harvest, a mushrooms still has a lot of growing left to do when the veil breaks. And with quite a bit of experience myself i can definitively say that there is no difference what so ever.
How exactly do you eat nothing but spores? Did you take tons of prints and scrape all the spores together? lol
That internet hearsay just so happens to be proven fact, spores contain nothing that makes you trip.