Radiallah & Karamallahu Wajwahu

[Sardar Miyan]

Salam Bro JAI, I read your Article
on Radiallah Anhu. You rightly
pointed out that we cannot tag this
to any particular Sahabi but Sahaba in general.
In this connection I wanted to know why the Muslim Ummah
calls Hazrat Ali as " Karamullah
Wajahu" كرم اللاه وجوهو& secondly why the Shia
call all their  Imams as " Alai hissalam"عليالسلام
which is reserved for Ambia &
all muslims call.Thanks