Are there other classifications of the branches of faith by scholars other than Ibn Hibban, which may include matters such as reverence for the Companions?

Other scholars besides Ibn Hibban have classified the branches of faith. Among the best works on this topic are Shu'ab al-Iman by al-Bayhaqi and its abridgment by al-Qazwini. Al-Bayhaqi mentioned that the love, veneration, and loyalty towards the Companions stem from the love of the Prophet, peace and blessings be upon him, citing verses and hadiths that indicate their virtue and the obligation to love them. If they have attained such a status, then Muslims are obligated to love them and draw closer to Allah through their love, because if Allah loves someone, then the servant must love those whom his Master loves.