When the Fathers teach unanimously it is a guide to Faith. Their individual opinions, however, may be wrong and just about every Father has taught something that was later overturned.
Jaynek, the Church Fathers do disagree on some things, but many times, the disagreement comes down to 2 or 3 options, which are very similar. Your logic would argue that there is no consensus on the time period of a “day” in Genesis, so, you say, we are free to interpret as we like. No! This is wrong.
As the PBC pointed out, yes, there was no consensus but there were 2 main opinions and ALL Catholics are to interpret WITHIN THOSE 2 options ONLY. Catholics are NOT free to come up with a 3rd option which is contrary to the Church Fathers.
So it is with scripture verses which the Church has not decided. We (laity) must still look to the Church Fathers (and the Doctors of the Church) and even if there is no consensus, our personal interpretation can ONLY be ONE OF the options which is supported by them, or part of them.
It doesn’t make any sense nor is it in keeping with the Church’s love of Traditions and Consistency that some new interpretation of scripture is going to come “out of left field”. It’s more likely that some future saint or saints will prove that this or that Church Father’s EXISTING opinion is true.