Pending digging through my old Latin texts, I'm with Jenet on this'n. Latin *did have what they called defective verbs, verbs that didn't have entries in every conjugation slot. Not sure about defective nouns, off-hand. Your link, Max, was a little dense for a quick perusal. I'll maybe print it out and read it at home. What I did read seemed to be more on the too much side than the too little, but.