Left-back Innocent Mdledle and left-side midfielder Franklin Cale were the other two players left out of the final squad.
But earlier tries from Matt Gafa and Ryan Esders and Howell's late brace left the home side well out of the play-off race.
He added their mental strength would be tested in a different way because of the amount of money involved, although he did not expect there to be issues if established players were left out of the side in place of up-and-coming stars.
He got away down the left side and picked out Cole, only for the in-form forward to fire straight at Myhill.
Ponting said a "lack of bowling" was the reason for leaving out left-armer Bollinger, who has been feeling his way back following a side strain.
The desperate Scarlets' challenge petered out, Malone sealing the win with a last-minute penalty that still left the home side the very slim consolation of a losing bonus point.
Chris Thorman notched a one-pointer to put Huddersfield 9-8 ahead with five minutes left, but Horne ensured his side got something out of the game.
The Russian, sometimes out of sorts in recent weeks, was seeing plenty of the ball on the left-hand side up against Hunt, a 20-year-old right-back making his first Huddersfield start.
Fit-again Leonardo Ghiraldini returns to the side and Gonzalo Garcia replaces Kaine Robertson who is left out of the squad.
Tierney was expected to return to the side for the trip to Leyton Orient on Tuesday but the left-back ended up sitting out the 4-2 defeat.
Fozzard joined the Robins from St Helens on a two-year contract at the start of the season but latterly has been in and out of the side and was left out of the team by Morgan, Rhys Morgan preferred to the former Great Britain prop forward at the Jungle.
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