I'm not. I'm pointing out that Apostolic Succession is not an objective barometer to gauge which is the one true church because multiple schismatic churches claim it. The fact that multiple schismatic churches claim it also shows that it is ineffective at preventing schism. In short, it is little more than a circular or self-affirming argument.
Indeed. You disagree on which church is the one true church. This is the issue we need an objective standard to solve. Since Apostolic Succession doesn't cut it, what does?
Mormon:
Eastern Orthodox:
Reformed:
Which of these is the odd one out? In the first two, you have churches circularly claiming ultimate authority for themselves. In the third, you have an objective standard of reference, an external ultimate authority.
Sure, but this is not an area that you really want to go. Not a single one of those councils reflects the Canon that the Eastern Orthodox use today. As for the councils themselves, they were primarily called by the Emperor to establish political unity in the empire. In reality, they led to further schisms and the empire itself is no more.
Since the Church Fathers were not a monolith, and neither do they uniformly fit into our modern categories, everyone "cherry picks" them. However, on this issue of Scripture having the ultimate authority (Sola Scriptura) I do not have to cherry pick them since they all believed it. They did not believe themselves or the Ecumenical councils to have such authority as Scripture, to believe otherwise would be anachronistic:
https://blog-tms-edu.cdn.ampproject.org/v/s/blog.tms.edu/sola-scriptura-and-the-church-fathers?amp_gsa=1&_js_v=a9&hs_amp=true&usqp=mq331AQIUAKwASCAAgM=#amp_tf=From %1$s&aoh=17674318715788&referrer=https://www.google.com&share=https://blog.tms.edu/sola-scriptura-and-the-church-fathers