Qurbaani & Halaal Slaughter

Sacrificing on the name of anyone besides Allah Ta'ala

Q: 

1. Is sacrificing meat for anyone other than Allah considered an act of shirk (associating partners with Allah), or is it regarded as a bid’ah (innovation) that does not amount to shirk? 

2. If it is indeed shirk, then what is the ruling if a Muslim sacrifices meat for a highly revered figure in Islam such as the Prophet Muhammad (peace and blessing of Allah be upon him), Prophet Isa (Jesus, peace be upon him), or Ali (may Allah be pleased with him); or alternatively, if the sacrifice is made for a sacred Islamic site like the Ka'bah or Masjid al-Aqsa? Would such an act nullify the person's faith (iman)?

6 shareholders distributing the 7th share of the qurbaani animal that was done for Nabi (sallallahu alaihi wasallam) equally

Q: If 6 shareholders put money together to make qurbani on behalf of Nabi صلى الله عليه وسلم with the 7th share of an animal, how will the meat of the 7th share be divided? Does it have to be shared equally between the 6 people same as the other 6 shares?