Thread: мало у кого

Originally Posted by xXHoax

(число -) мало (тех,) кто...

I’m not sure there is an omitted noun here. The stress position in the phrases «число мало́» and «ма́ло [тех,] кто…» is different. The history of Russian stress is complicated, maybe it used to be the same construction earlier, but in the contemporary language, the adverb ма́ло and the short adjective мало́ are different words.
Also, you can say «мно́го [тех,] кто…», but *«число много» is impossible regardless of the stress.