Do you even understand the basis of takfeer? We cannot call someone a kaafir because of an action. The Saudis could very well destroy the ka'ba but that is no basis for takfeer.
And no, Ibaadis do not make takfeer of Umar and 'Ali رضي الله عنهما. They believe them to be deviants. Ibaadis are thus considered deviants. Furthermore, if a person has cancer but has a small itch, would he complain about the cancer or the mild itch? The Shi'a are a cancer. The Ibaadis are a mild itch, if even that. You never see Ibaadis verbally assaulting the sahaba

or the mothers of the believers, contrary to the Shi'as. The Ibaadis also don't believe in divine imams - which is a bigger issue and one of the primary issues that takes Shi'ism out of Islam. The Ibaadis don't believe in the tahreef of the Qur'an, while the Shi'a do, which also takes them outside of Islam (also, if A thinks that B is still a Muslim but B believes that the Qur'an is changed, then both A and B will be considered non-Muslim if A knows that B believes that the Qur'an is changed).
You should really understand the issue before asking ridiculous questions. Have you not come across the extremely famous hadeeth about the Ahlus Sunnah wal Jama'ah being the "saved" group and thus entering paradise? Furthermore, the 4 imams of Sunni Islam are Imams of FIQH, which is not the major defining issue when it comes to someone being a kaafir or not. A Shi'a committing mut'ah does not make him a non-Muslim. A Shi'a doing matam does not make him a non-Muslim. It is what the Shi'a believes that makes him a non-Muslim - if a Shi'a believes in his divine imams, then that is kufr. If a Shi'a believes in tahreef of the Qur'an, that is kufr. If the Shi'a attacks and insults the wives of Rasoolullah

, that is kufr.
Bookmarks