Is what was mentioned about Imam Muslim kissing the feet of Imam Al-Bukhari, and Imam An-Nasa'i kissing the feet of Imam At-Tirmidhi, out of reverence for them, true? And what is the concept of Wilayah (sainthood/guardianship) and the Awliya' Allah As-Salihin (righteous saints of Allah) and the duty towards them according to Ahl As-Sunnah?

Attending Friday prayer is obligatory and it is not permissible to abandon it except with a legitimate excuse. The ruling on praying behind an innovator has been detailed, as long as their innovation is not one that constitutes disbelief. There are also previous fatwas that have addressed the topic of saints, seeking blessings from people of virtue, and kissing them.