Bible only is not a false principle. However, it is the ultimate rule of our faith. That does not mean that we shouldn’t be guided by the elders of our churches or any true promptings of the Holy Spirit.
For example, what is the authority for the trinitarian theology of historic Christianity? Every authority I’ve seen, ultimately falls back on scripture, even the early fathers.
One should never give the impression that Scripture is an unworthy principle.
There is no historical/Biblical evidence for the "Bible only" principle.
"However, it is the ultimate rule of our faith."
Same answer as above.