Throwing 5 tds is typical for a veteran Houston qb, we never had a true freshman do that, at least not that I can recall unless Piland and/or Kolb did it in 2010.
Most TD passes thrown in a game by a UH qb:
David Klingler- 11 TD passes in a game (84-21 win over Eastern Washington, 1990)
Andre Ware- 6 TD passes in a game (95-21 win over SMU, 1989)
Kevin Kolb- 6 TD passes in a game (multiple games never threw beyond that)
Case Keenim- 9 TD passes in a game (73-34 win over Rice, 2011)
John O'Korn*- 5 TD passes in a game (49-14 win over Rutgers, 2013)
* = active player