@Avirah – if you wanna say EVEN a Rebbe is toraso umnaso (an excuse for working) is patur from davening – then KOL SHEKAYN a real Uman is Patur!
The gemara says bferush that “Am shebasadeh” – working ppl – do not hafta daven at all – the chazaras hashatz is for them. but, a Rebbe also? that’s a chidush – only R Shimon was like that. Most Non-workers must daven al pi halcha