Re: Triple Talaq valid?
for that we have to know the ilm of Fiqh. Sunnat of prophet takes over the words of Quran with the assumption that if Prophet was doing it, knowingly that Quran said otherwise, then maybe he was under a different order from Allah SWT and hence its safe to follow sunnat (Quran itself says that Sunnat is the safest path).
On the similar note, if practice of Sahaba found to be different than a hadees, then Imam Abu Hanifa made the ruling out of practice of Sahaba, because of the same logic that maybe they heard or saw Prophet doing or saying something that never got recorded.
Following the doings of Prophet over Quran and doings of Sahaba over Hadees is not the disrespect of Quran or Hadees. Its the trust on Prophet and his Jammat (Hence the term Ahle Sunnat wal Jamaat)