Surely the Holy Spirit has spoken continuously through the ages to great men of position, and also the most humble. Are you denying that the Holy Spirit still speaks to us today, or that he stopped with the early Church councils? Christ said He would be with us always. Of course, to deny/lessen the importance of the Scriptures in favor of tradition and early church fathers is not necessarily wise. Satan and his minions will influence people even today, yet without the Scriptures as a baseline to judge these influences against, our faith is just a sheet blowing in the wind.
I’m definitly denying that the Holy Spirit would ever need to contradict itself, and yes I do beleif the WHOLE WORD has been delivered to the Church, and there is no need for innovation or adding to that Word. The only need for the councils in the first place was to correct misunderstandings and cast false teachings out of the church not to add to the truth.